diff --git a/src/lib/modules/file/upload.ts b/src/lib/modules/file/upload.ts
index a2a9707..71a38fb 100644
--- a/src/lib/modules/file/upload.ts
+++ b/src/lib/modules/file/upload.ts
@@ -15,6 +15,7 @@ import type {
   DuplicateFileScanRequest,
   DuplicateFileScanResponse,
   FileUploadRequest,
+  FileUploadResponse,
 } from "$lib/server/schemas";
 import {
   fileUploadStatusStore,
@@ -131,7 +132,7 @@ const requestFileUpload = limitFunction(
       return value;
     });
 
-    await axios.post("/api/file/upload", form, {
+    const res = await axios.post("/api/file/upload", form, {
       onUploadProgress: ({ progress, rate, estimated }) => {
         status.update((value) => {
           value.progress = progress;
@@ -141,11 +142,14 @@ const requestFileUpload = limitFunction(
         });
       },
     });
+    const { file }: FileUploadResponse = res.data;
 
     status.update((value) => {
       value.status = "uploaded";
       return value;
     });
+
+    return { fileId: file };
   },
   { concurrency: 1 },
 );
@@ -156,7 +160,7 @@ export const uploadFile = async (
   hmacSecret: HmacSecret,
   masterKey: MasterKey,
   onDuplicate: () => Promise<boolean>,
-) => {
+): Promise<{ fileId: number; fileBuffer: ArrayBuffer } | undefined> => {
   const status = writable<FileUploadStatus>({
     name: file.name,
     parentId,
@@ -182,7 +186,7 @@ export const uploadFile = async (
         value = value.filter((v) => v !== status);
         return value;
       });
-      return false;
+      return undefined;
     }
 
     const {
@@ -219,8 +223,8 @@ export const uploadFile = async (
     form.set("content", new Blob([fileEncrypted.ciphertext]));
     form.set("checksum", fileEncryptedHash);
 
-    await requestFileUpload(status, form);
-    return true;
+    const { fileId } = await requestFileUpload(status, form);
+    return { fileId, fileBuffer };
   } catch (e) {
     status.update((value) => {
       value.status = "error";
diff --git a/src/lib/server/db/client.ts b/src/lib/server/db/client.ts
index 08f2c98..cb873c7 100644
--- a/src/lib/server/db/client.ts
+++ b/src/lib/server/db/client.ts
@@ -50,7 +50,7 @@ export const createClient = async (encPubKey: string, sigPubKey: string, userId:
         .insertInto("user_client")
         .values({ user_id: userId, client_id: clientId })
         .execute();
-      return { clientId };
+      return { id: clientId };
     });
 };
 
diff --git a/src/lib/server/db/file.ts b/src/lib/server/db/file.ts
index 219dc42..20343b2 100644
--- a/src/lib/server/db/file.ts
+++ b/src/lib/server/db/file.ts
@@ -203,7 +203,7 @@ export const registerFile = async (params: NewFile) => {
     throw new Error("Invalid arguments");
   }
 
-  await db.transaction().execute(async (trx) => {
+  return await db.transaction().execute(async (trx) => {
     const mek = await trx
       .selectFrom("master_encryption_key")
       .select("version")
@@ -259,6 +259,7 @@ export const registerFile = async (params: NewFile) => {
         new_name: params.encName,
       })
       .execute();
+    return { id: fileId };
   });
 };
 
diff --git a/src/lib/server/schemas/file.ts b/src/lib/server/schemas/file.ts
index ed0af94..cb6af28 100644
--- a/src/lib/server/schemas/file.ts
+++ b/src/lib/server/schemas/file.ts
@@ -60,3 +60,8 @@ export const fileUploadRequest = z.object({
   lastModifiedAtIv: z.string().base64().nonempty(),
 });
 export type FileUploadRequest = z.infer<typeof fileUploadRequest>;
+
+export const fileUploadResponse = z.object({
+  file: z.number().int().positive(),
+});
+export type FileUploadResponse = z.infer<typeof fileUploadResponse>;
diff --git a/src/lib/server/services/client.ts b/src/lib/server/services/client.ts
index 0d0b82d..ee1b5b3 100644
--- a/src/lib/server/services/client.ts
+++ b/src/lib/server/services/client.ts
@@ -63,7 +63,7 @@ export const registerUserClient = async (
     }
 
     try {
-      const { clientId } = await createClient(encPubKey, sigPubKey, userId);
+      const { id: clientId } = await createClient(encPubKey, sigPubKey, userId);
       return { challenge: await createUserClientChallenge(ip, userId, clientId, encPubKey) };
     } catch (e) {
       if (e instanceof IntegrityError && e.message === "Public key(s) already registered") {
diff --git a/src/lib/server/services/file.ts b/src/lib/server/services/file.ts
index 519bdfd..1f7f34f 100644
--- a/src/lib/server/services/file.ts
+++ b/src/lib/server/services/file.ts
@@ -131,11 +131,12 @@ export const uploadFile = async (
       throw new Error("Invalid checksum");
     }
 
-    await registerFile({
+    const { id: fileId } = await registerFile({
       ...params,
       path,
       encContentHash: hash,
     });
+    return { fileId };
   } catch (e) {
     await safeUnlink(path);
 
diff --git a/src/routes/(main)/directory/[[id]]/service.ts b/src/routes/(main)/directory/[[id]]/service.ts
index c9a62b2..8d36fb2 100644
--- a/src/routes/(main)/directory/[[id]]/service.ts
+++ b/src/routes/(main)/directory/[[id]]/service.ts
@@ -1,7 +1,7 @@
 import { callGetApi, callPostApi } from "$lib/hooks";
 import { storeHmacSecrets } from "$lib/indexedDB";
 import { generateDataKey, wrapDataKey, unwrapHmacSecret, encryptString } from "$lib/modules/crypto";
-import { deleteFileCache, uploadFile } from "$lib/modules/file";
+import { storeFileCache, deleteFileCache, uploadFile } from "$lib/modules/file";
 import type {
   DirectoryRenameRequest,
   DirectoryCreateRequest,
@@ -63,7 +63,11 @@ export const requestFileUpload = async (
   masterKey: MasterKey,
   onDuplicate: () => Promise<boolean>,
 ) => {
-  return await uploadFile(file, parentId, hmacSecret, masterKey, onDuplicate);
+  const res = await uploadFile(file, parentId, hmacSecret, masterKey, onDuplicate);
+  if (!res) return false;
+
+  storeFileCache(res.fileId, res.fileBuffer); // Intended
+  return true;
 };
 
 export const requestDirectoryEntryRename = async (
diff --git a/src/routes/api/file/upload/+server.ts b/src/routes/api/file/upload/+server.ts
index b54a542..55db93f 100644
--- a/src/routes/api/file/upload/+server.ts
+++ b/src/routes/api/file/upload/+server.ts
@@ -1,8 +1,12 @@
 import Busboy from "@fastify/busboy";
-import { error, text } from "@sveltejs/kit";
+import { error, json } from "@sveltejs/kit";
 import { Readable, Writable } from "stream";
 import { authorize } from "$lib/server/modules/auth";
-import { fileUploadRequest } from "$lib/server/schemas";
+import {
+  fileUploadRequest,
+  fileUploadResponse,
+  type FileUploadResponse,
+} from "$lib/server/schemas";
 import { uploadFile } from "$lib/server/services/file";
 import type { RequestHandler } from "./$types";
 
@@ -87,8 +91,8 @@ export const POST: RequestHandler = async ({ locals, request }) => {
           if (!metadata || content) error(400, "Invalid request body");
           content = file;
 
-          await uploadFile(metadata, content, checksum);
-          resolve(text("File uploaded", { headers: { "Content-Type": "text/plain" } }));
+          const { fileId } = await uploadFile(metadata, content, checksum);
+          resolve(json(fileUploadResponse.parse({ file: fileId } satisfies FileUploadResponse)));
         }),
       );
       bb.on("finish", () => rejectChecksum(new Error("Invalid request body")));