diff --git a/deno.lock b/deno.lock
index 155171d..154a152 100644
--- a/deno.lock
+++ b/deno.lock
@@ -21,14 +21,17 @@
     ],
     "packageJson": {
       "dependencies": [
+        "npm:@atcute/cid@^2.2.2",
         "npm:@picocss/pico@^2.1.1",
         "npm:astro-purgecss@^5.2.2",
         "npm:astro-scope@^3.0.1",
         "npm:astro@^5.7.4",
+        "npm:fast-uri@^3.0.6",
         "npm:iconoir@^7.11.0",
         "npm:idb-keyval@^6.2.1",
         "npm:native-file-system-adapter@^3.0.1",
         "npm:purgecss@^7.0.2",
+        "npm:query-string@^9.1.2",
         "npm:sass@^1.87.0",
         "npm:throttle-debounce@^5.0.2",
         "npm:xxh32@^2.0.5"
diff --git a/package-lock.json b/package-lock.json
index c3fccec..43d60ce 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,11 +5,14 @@
   "packages": {
     "": {
       "dependencies": {
+        "@atcute/cid": "^2.2.2",
         "@picocss/pico": "^2.1.1",
         "@web-applets/sdk": "file:../../unternet-co/web-applets/sdk/",
+        "fast-uri": "^3.0.6",
         "iconoir": "^7.11.0",
         "idb-keyval": "^6.2.1",
         "native-file-system-adapter": "^3.0.1",
+        "query-string": "^9.1.2",
         "spellcaster": "gordonbrander/spellcaster#1613e5e3b7f202cfe57f37ea7c637ec83588a297",
         "throttle-debounce": "^5.0.2",
         "xxh32": "^2.0.5"
@@ -104,6 +107,28 @@
         "node": "^18.17.1 || ^20.3.0 || >=22.0.0"
       }
     },
+    "node_modules/@atcute/cid": {
+      "version": "2.2.2",
+      "resolved": "https://registry.npmjs.org/@atcute/cid/-/cid-2.2.2.tgz",
+      "integrity": "sha512-deAGMqLAyplt7eIukhkjlsGubvrcMrtXkDKlUYZDo4WUdL7hSjBywtPXf6SbMK+Mjvst7l2+83OqTcY5AuuxtA==",
+      "dependencies": {
+        "@atcute/multibase": "^1.1.3",
+        "@atcute/uint8array": "^1.0.1"
+      }
+    },
+    "node_modules/@atcute/multibase": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/@atcute/multibase/-/multibase-1.1.3.tgz",
+      "integrity": "sha512-vQQO0tDuQPguBvHdgV3ryn7R8U6beQ50KA/juYm+dCeT/3hOK2stMbX+IaW8JEuwkT5lJsU8wDIOicQT4mB7Ag==",
+      "dependencies": {
+        "@atcute/uint8array": "^1.0.1"
+      }
+    },
+    "node_modules/@atcute/uint8array": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@atcute/uint8array/-/uint8array-1.0.1.tgz",
+      "integrity": "sha512-AAnlFKyfDRgb9GNZJbhQ6OuMhbmNPirQyapb8KnmcEhxQZ3+tt+4NcwqekEegY4MpNqSTYeeTdyxq0wGZv1JHg=="
+    },
     "node_modules/@babel/helper-string-parser": {
       "version": "7.25.9",
       "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.25.9.tgz",
@@ -2398,6 +2423,14 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/decode-uri-component": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/decode-uri-component/-/decode-uri-component-0.4.1.tgz",
+      "integrity": "sha512-+8VxcR21HhTy8nOt6jf20w0c9CADrw1O8d+VZ/YzzCt4bJ3uBjw+D1q2osAB8RnpwwaeYBxy0HyKQxD5JBMuuQ==",
+      "engines": {
+        "node": ">=14.16"
+      }
+    },
     "node_modules/defu": {
       "version": "6.1.4",
       "resolved": "https://registry.npmjs.org/defu/-/defu-6.1.4.tgz",
@@ -2605,6 +2638,21 @@
       "integrity": "sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==",
       "dev": true
     },
+    "node_modules/fast-uri": {
+      "version": "3.0.6",
+      "resolved": "https://registry.npmjs.org/fast-uri/-/fast-uri-3.0.6.tgz",
+      "integrity": "sha512-Atfo14OibSv5wAp4VWNsFYE1AchQRTv9cBGWET4pZWHzYshFSS9NQI6I57rdKn9croWVMbYFbLhJ+yJvmZIIHw==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fastify"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/fastify"
+        }
+      ]
+    },
     "node_modules/fdir": {
       "version": "6.4.4",
       "resolved": "https://registry.npmjs.org/fdir/-/fdir-6.4.4.tgz",
@@ -2655,6 +2703,17 @@
         "node": ">=8"
       }
     },
+    "node_modules/filter-obj": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/filter-obj/-/filter-obj-5.1.0.tgz",
+      "integrity": "sha512-qWeTREPoT7I0bifpPUXtxkZJ1XJzxWtfoWWkdVGqa+eCr3SHW/Ocp89o8vLvbUuQnadybJpjOKu4V+RwO6sGng==",
+      "engines": {
+        "node": ">=14.16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/flattie": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/flattie/-/flattie-1.1.1.tgz",
@@ -4478,6 +4537,22 @@
         "purgecss": "bin/purgecss.js"
       }
     },
+    "node_modules/query-string": {
+      "version": "9.1.2",
+      "resolved": "https://registry.npmjs.org/query-string/-/query-string-9.1.2.tgz",
+      "integrity": "sha512-s3UlTyjxRux4KjwWaJsjh1Mp8zoCkSGKirbD9H89pEM9UOZsfpRZpdfzvsy2/mGlLfC3NnYVpy2gk7jXITHEtA==",
+      "dependencies": {
+        "decode-uri-component": "^0.4.1",
+        "filter-obj": "^5.1.0",
+        "split-on-first": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/radix3": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/radix3/-/radix3-1.1.2.tgz",
@@ -4950,6 +5025,17 @@
         "signal-polyfill": "^0.2.0"
       }
     },
+    "node_modules/split-on-first": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/split-on-first/-/split-on-first-3.0.0.tgz",
+      "integrity": "sha512-qxQJTx2ryR0Dw0ITYyekNQWpz6f8dGd7vffGNflQQ3Iqj9NJ6qiZ7ELpZsJ/QBhIVAiDfXdag3+Gp8RvWa62AA==",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/string-width": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-7.2.0.tgz",
diff --git a/package.json b/package.json
index 2e32294..b463cd8 100644
--- a/package.json
+++ b/package.json
@@ -1,10 +1,13 @@
 {
   "dependencies": {
+    "@atcute/cid": "^2.2.2",
     "@picocss/pico": "^2.1.1",
     "@web-applets/sdk": "file:../../unternet-co/web-applets/sdk/",
+    "fast-uri": "^3.0.6",
     "iconoir": "^7.11.0",
     "idb-keyval": "^6.2.1",
     "native-file-system-adapter": "^3.0.1",
+    "query-string": "^9.1.2",
     "spellcaster": "gordonbrander/spellcaster#1613e5e3b7f202cfe57f37ea7c637ec83588a297",
     "throttle-debounce": "^5.0.2",
     "xxh32": "^2.0.5"
diff --git a/src/pages/core/types.d.ts b/src/pages/core/types.d.ts
index 67fa785..9792832 100644
--- a/src/pages/core/types.d.ts
+++ b/src/pages/core/types.d.ts
@@ -1,35 +1,17 @@
 /* OUTPUT */
 
 export interface Output<T = TrackTags> {
-  sources: Source[];
   tracks: Track<T>[];
 }
 
 export type OutputGetter = ({ name }: { name: string }) => Promise<Uint8Array | undefined>;
 export type OutputSetter = ({ data, name }: { data: Uint8Array; name: string }) => Promise<void>;
 
-/* SOURCES */
-// TODO: Rename to input?
-
-export interface Source<Meta = Record<string, string>> {
-  id: string;
-  meta: Meta;
-
-  // NOTE: This is associated with a data input applet.
-  //       For example, `diffuse.sh/storage/amazon-s3/`
-  //
-  // This association is needed to, for example,
-  // optionally translate permanent URIs into usable
-  // URLs in order actually play the audio track.
-  appletURI: string;
-}
-
 /* TRACKS */
 
 export interface Track<Tags = TrackTags> {
   id: string;
-  sourceId: string;
-  tags: Tags;
+  tags?: Tags;
 
   // NOTE: This is a "semi-permanent" URI.
   //
diff --git a/src/pages/engine/audio/_manifest.json b/src/pages/engine/audio/_manifest.json
index 655c0bb..efcf2c6 100644
--- a/src/pages/engine/audio/_manifest.json
+++ b/src/pages/engine/audio/_manifest.json
@@ -59,19 +59,15 @@
             "type": "array",
             "description": "The tracks we want to render.",
             "items": {
-              "anyOf": [
-                {
-                  "type": "object",
-                  "properties": {
-                    "id": { "type": "string" },
-                    "isPreload": { "type": "boolean" },
-                    "mimeType": { "type": "string" },
-                    "progress": { "type": "number" },
-                    "url": { "type": "string" }
-                  },
-                  "required": ["id", "url"]
-                }
-              ]
+              "type": "object",
+              "properties": {
+                "id": { "type": "string" },
+                "isPreload": { "type": "boolean" },
+                "mimeType": { "type": "string" },
+                "progress": { "type": "number" },
+                "url": { "type": "string" }
+              },
+              "required": ["id", "url"]
             }
           }
         },
diff --git a/src/pages/input/native-fs/_applet.astro b/src/pages/input/native-fs/_applet.astro
new file mode 100644
index 0000000..1cb65fc
--- /dev/null
+++ b/src/pages/input/native-fs/_applet.astro
@@ -0,0 +1,155 @@
+<script>
+  import * as CID from "@atcute/cid";
+  import * as IDB from "idb-keyval";
+
+  import { applets } from "@web-applets/sdk";
+  import { type FileSystemDirectoryHandle, showDirectoryPicker } from "native-file-system-adapter";
+  import QS from "query-string";
+  import URI from "fast-uri";
+
+  import type { Track } from "@applets/core/types.d.ts";
+  import { isAudioFile } from "@scripts/inputs/common";
+
+  type Handles = Array<{ id: string; handle: FileSystemDirectoryHandle }>;
+
+  // TODO: Add ability to list cached tracks from other devices (ie. unknown handle ids)
+
+  ////////////////////////////////////////////
+  // SETUP
+  ////////////////////////////////////////////
+  const IDB_PREFIX = "@applets/input/native-fs";
+  const IDB_HANDLES = `${IDB_PREFIX}/handles`;
+
+  const context = applets.register();
+
+  ////////////////////////////////////////////
+  // ACTIONS
+  ////////////////////////////////////////////
+  const list = async (cachedTracks: Track[] = []) => {
+    const handles: Handles = (await IDB.get(IDB_HANDLES)) ?? [];
+
+    const processed: Track[][] = await Promise.all(
+      handles.map(({ id, handle }) => recursiveList(handle, id, [])),
+    );
+
+    const cache = cachedTracks.reduce(
+      (acc: Record<string, Record<string, Track>>, track: Track) => {
+        const handleId = trackHandleId(track);
+        const cid = trackCid(track);
+
+        if (!handleId || !cid) return acc;
+
+        return { ...acc, [handleId]: { ...(acc[handleId] || {}), [cid]: track } };
+      },
+      {},
+    );
+
+    const groups = processed.flat(1).reduce(
+      (acc, track) => {
+        const handleId = trackHandleId(track);
+        const cid = trackCid(track);
+
+        if (!handleId) throw new Error("New tracks are missing a handle id!");
+        if (!cid) throw new Error("New tracks are missing a cid!");
+
+        return { ...acc, [handleId]: { ...acc[handleId], [cid]: track } };
+      },
+      handles.reduce((acc: Record<string, Record<string, Track>>, handle) => {
+        return { ...acc, [handle.id]: {} };
+      }, cache),
+    );
+
+    const data = Object.values(groups)
+      .map((tracks) => Object.values(tracks))
+      .flat(1)
+      .sort((a: any, b: any) => {
+        if (a.uri < b.uri) return -1;
+        if (a.uri > b.uri) return 1;
+        return 0;
+      });
+
+    // TODO: Should be able to just return the data in the handler
+    context.data = data;
+    return data;
+  };
+
+  const resolve = async () => {
+    // TODO: Resolve the track URI to an URL.
+    //       This can utilise `createObjectURL()`
+    //
+    //       Get a file handle, then the `File` ref,
+    //       and pass it to `createObjectURL()`
+  };
+
+  const mount = async () => {
+    await showDirectoryPicker()
+      .then(async (handle) => {
+        const existingHandles: Handles = (await IDB.get(IDB_HANDLES)) ?? [];
+        const id = crypto.randomUUID();
+
+        await handle.requestPermission({ mode: "read" });
+        await IDB.set(IDB_HANDLES, [...existingHandles, { id, handle }]);
+      })
+      .catch(() => {});
+  };
+
+  context.setActionHandler("list", list);
+  context.setActionHandler("resolve", resolve);
+  context.setActionHandler("mount", mount);
+
+  ////////////////////////////////////////////
+  // 🛠️
+  ////////////////////////////////////////////
+  function trackCid(track: Track): string | undefined {
+    const a = URI.parse(track.uri);
+    const cid = a.query ? QS.parse(a.query).cid || undefined : undefined;
+    return Array.isArray(cid) && cid[0] ? cid[0] : typeof cid === "string" ? cid : undefined;
+  }
+
+  function trackHandleId(track: Track): string | undefined {
+    const a = URI.parse(track.uri);
+    return a.host;
+  }
+
+  async function recursiveList(
+    dir: FileSystemDirectoryHandle,
+    rootHandleId: string,
+    path: string[],
+  ): Promise<Track[]> {
+    const tracks: Track[] = [];
+
+    for await (const item of dir.values()) {
+      if (item.kind === "file" && isAudioFile(item.name)) {
+        const fileHandle = await dir.getFileHandle(item.name);
+        const file = await fileHandle.getFile();
+        const bytes = new Uint8Array(await file.arrayBuffer());
+        const cid = await CID.create(0x55, bytes);
+
+        const uri = URI.serialize({
+          scheme: "file+local",
+          host: rootHandleId,
+          path: `${path.length ? "/" + path.join("/") : ""}/${item.name}`,
+          query: QS.stringify({ cid: CID.toString(cid) }),
+        });
+
+        console.log(uri);
+
+        const track: Track = {
+          id: crypto.randomUUID(),
+          uri,
+        };
+
+        tracks.push(track);
+      } else if (item.kind === "directory") {
+        const nestedItems = await recursiveList(item as FileSystemDirectoryHandle, rootHandleId, [
+          ...path,
+          item.name,
+        ]);
+
+        tracks.push(...nestedItems);
+      }
+    }
+
+    return tracks;
+  }
+</script>
diff --git a/src/pages/input/native-fs/_manifest.json b/src/pages/input/native-fs/_manifest.json
new file mode 100644
index 0000000..597ce35
--- /dev/null
+++ b/src/pages/input/native-fs/_manifest.json
@@ -0,0 +1,34 @@
+{
+  "name": "diffuse/input/native-fs",
+  "title": "Diffuse Input | Native File System",
+  "entrypoint": "index.html",
+  "input_properties": {
+    "scheme": "file+local"
+  },
+  "actions": {
+    "list": {
+      "title": "List",
+      "description": "List tracks.",
+      "params_schema": {
+        "type": "object",
+        "properties": {
+          "tracks": {
+            "type": "array",
+            "description": "A list of (cached) tracks with an uri matching the scheme",
+            "items": {
+              "type": "object"
+            }
+          }
+        }
+      }
+    },
+    "mount": {
+      "title": "Mount",
+      "description": "Prepare for usage."
+    },
+    "unmount": {
+      "title": "Unmount",
+      "description": "Callback after usage."
+    }
+  }
+}
diff --git a/src/pages/input/native-fs/index.astro b/src/pages/input/native-fs/index.astro
new file mode 100644
index 0000000..dfb1e1a
--- /dev/null
+++ b/src/pages/input/native-fs/index.astro
@@ -0,0 +1,9 @@
+---
+import Layout from "@layouts/applet.astro";
+import Applet from "./_applet.astro";
+import { title } from "./_manifest.json";
+---
+
+<Layout title={title}>
+  <Applet />
+</Layout>
diff --git a/src/pages/output/native-fs/_applet.astro b/src/pages/output/native-fs/_applet.astro
index 53726d1..23ffed8 100644
--- a/src/pages/output/native-fs/_applet.astro
+++ b/src/pages/output/native-fs/_applet.astro
@@ -17,7 +17,7 @@
   // ACTIONS
   ////////////////////////////////////////////
   const get: OutputGetter = async ({ name }) => {
-    const handle = await IDB.get(IDB_DEVICE_KEY);
+    const handle: FileSystemDirectoryHandle | null = (await IDB.get(IDB_DEVICE_KEY)) ?? null;
     if (!handle) throw new Error("Storage not configured properly, handle not found.");
 
     try {
@@ -34,7 +34,7 @@
   };
 
   const put: OutputSetter = async ({ data, name }) => {
-    const handle = await IDB.get(IDB_DEVICE_KEY);
+    const handle: FileSystemDirectoryHandle | null = (await IDB.get(IDB_DEVICE_KEY)) ?? null;
     if (!handle) throw new Error("Storage not configured properly, handle not found.");
     const fileHandle = await handle.getFileHandle(name, { create: true });
     const stream = await fileHandle.createWritable();
diff --git a/src/scripts/inputs/common.ts b/src/scripts/inputs/common.ts
new file mode 100644
index 0000000..167a7b2
--- /dev/null
+++ b/src/scripts/inputs/common.ts
@@ -0,0 +1,3 @@
+export function isAudioFile(filename: string) {
+  return filename.match(/\.(flac|m4a|mp3|mp4|ogg|opus|wav|webm)$/);
+}
diff --git a/src/scripts/themes/pilot/index.ts b/src/scripts/themes/pilot/index.ts
index 733dc98..212accb 100644
--- a/src/scripts/themes/pilot/index.ts
+++ b/src/scripts/themes/pilot/index.ts
@@ -23,6 +23,10 @@ const engine = {
   queue: await applet<QueueEngine.State>("../../engine/queue"),
 };
 
+const input = {
+  nativeFs: await applet("../../input/native-fs"),
+};
+
 const _orchestrator = {
   queue: await applet("../../orchestrator/single-queue"),
   output: await applet<Output>("../../orchestrator/output-management"),
@@ -91,3 +95,10 @@ reactive(
     }
   },
 );
+
+// TODO:
+document.onclick = async () => {
+  await input.nativeFs.sendAction("mount");
+  await input.nativeFs.sendAction("list");
+  console.log(input.nativeFs.data);
+};
diff --git a/src/styles/themes/pilot/index.css b/src/styles/themes/pilot/index.css
index 265a3b3..2ad46e2 100644
--- a/src/styles/themes/pilot/index.css
+++ b/src/styles/themes/pilot/index.css
@@ -52,7 +52,9 @@ iframe {
  ***********************************/
 iframe[src*="/configurator/"],
 iframe[src*="/engine/"],
-iframe[src*="/orchestrator/"] {
+iframe[src*="/input/"],
+iframe[src*="/orchestrator/"],
+iframe[src*="/output/"] {
   height: 0;
   left: 110vw;
   opacity: 0;