diff --git a/packages/backend/package.json b/packages/backend/package.json
index 80484f95ce..a629a96ccd 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -25,6 +25,7 @@
 		"@bull-board/api": "^4.6.4",
 		"@bull-board/koa": "^4.6.4",
 		"@bull-board/ui": "^4.6.4",
+		"@cutls/megalodon": "5.1.15",
 		"@discordapp/twemoji": "14.0.2",
 		"@elastic/elasticsearch": "7.17.0",
 		"@koa/cors": "3.4.3",
@@ -37,12 +38,11 @@
 		"@tensorflow/tfjs": "^4.2.0",
 		"ajv": "8.11.2",
 		"archiver": "5.3.1",
-		"koa-body": "^6.0.1",
 		"autobind-decorator": "2.4.0",
 		"autolinker": "4.0.0",
-		"axios": "^1.3.2",
 		"autwh": "0.1.0",
 		"aws-sdk": "2.1277.0",
+		"axios": "^1.3.2",
 		"bcryptjs": "2.4.3",
 		"blurhash": "1.1.5",
 		"bull": "4.10.2",
@@ -71,6 +71,7 @@
 		"jsonld": "6.0.0",
 		"jsrsasign": "10.6.1",
 		"koa": "2.13.4",
+		"koa-body": "^6.0.1",
 		"koa-bodyparser": "4.3.0",
 		"koa-favicon": "2.1.0",
 		"koa-json-body": "5.3.0",
@@ -79,7 +80,7 @@
 		"koa-send": "5.0.1",
 		"koa-slow": "2.1.0",
 		"koa-views": "7.0.2",
-		"@cutls/megalodon": "5.1.15",
+		"koa2-formidable": "^1.0.3",
 		"mfm-js": "0.23.2",
 		"mime-types": "2.1.35",
 		"multer": "1.4.4-lts.1",
diff --git a/packages/backend/src/server/api/index.ts b/packages/backend/src/server/api/index.ts
index 593c7a284c..ddcb9a8842 100644
--- a/packages/backend/src/server/api/index.ts
+++ b/packages/backend/src/server/api/index.ts
@@ -6,6 +6,7 @@ import Koa from "koa";
 import Router from "@koa/router";
 import multer from "@koa/multer";
 import bodyParser from "koa-bodyparser";
+const formidable = require('koa2-formidable')
 import cors from "@koa/cors";
 import { apiMastodonCompatible } from './mastodon/ApiMastodonCompatibleService.js';
 import { Instances, AccessTokens, Users } from "@/models/index.js";
@@ -23,15 +24,6 @@ import twitter from "./service/twitter.js";
 // Init app
 const app = new Koa();
 
-// Init multer instance
-const upload = multer({
-	storage: multer.diskStorage({}),
-	limits: {
-		fileSize: config.maxFileSize || 262144000,
-		files: 1,
-	},
-});
-
 app.use(
 	cors({
 		origin: "*",
@@ -44,6 +36,8 @@ app.use(async (ctx, next) => {
 	await next();
 });
 
+app.use(formidable());
+
 app.use(
 	bodyParser({
 		// リクエストが multipart/form-data でない限りはJSONだと見なす
@@ -55,9 +49,14 @@ app.use(
 	}),
 );
 
-app.use(
-	upload.any()
-);
+// Init multer instance
+const upload = multer({
+	storage: multer.diskStorage({}),
+	limits: {
+		fileSize: config.maxFileSize || 262144000,
+		files: 1,
+	},
+});
 
 // Init router
 const router = new Router();
@@ -71,6 +70,7 @@ for (const endpoint of [...endpoints, ...compatibility]) {
 	if (endpoint.meta.requireFile) {
 		router.post(
 			`/${endpoint.name}`,
+			upload.single("file"),
 			handler.bind(null, endpoint),
 		);
 	} else {
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 54880d9c92..5c6765f2ed 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -164,6 +164,7 @@ importers:
       koa-send: 5.0.1
       koa-slow: 2.1.0
       koa-views: 7.0.2
+      koa2-formidable: ^1.0.3
       mfm-js: 0.23.2
       mime-types: 2.1.35
       mocha: 10.2.0
@@ -278,6 +279,7 @@ importers:
       koa-send: 5.0.1
       koa-slow: 2.1.0
       koa-views: 7.0.2_6tybghmia4wsnt33xeid7y4rby
+      koa2-formidable: 1.0.3
       mfm-js: 0.23.2
       mime-types: 2.1.35
       multer: 1.4.4-lts.1
@@ -6370,6 +6372,11 @@ packages:
     dependencies:
       fetch-blob: 3.2.0
 
+  /formidable/1.2.6:
+    resolution: {integrity: sha512-KcpbcpuLNOwrEjnbpMC0gS+X8ciDoZE1kkqzat4a8vrprf+s9pKNQ/QIwWfbfs4ltgmFl3MD177SNTkve3BwGQ==}
+    deprecated: 'Please upgrade to latest, formidable@v2 or formidable@v3! Check these notes: https://bit.ly/2ZEqIau'
+    dev: false
+
   /formidable/2.1.1:
     resolution: {integrity: sha512-0EcS9wCFEzLvfiks7omJ+SiYJAiD+TzK4Pcw1UlUoGnhUxDcMKjt0P7x8wEb0u6OHu8Nb98WG3nxtlF5C7bvUQ==}
     dependencies:
@@ -8381,6 +8388,12 @@ packages:
       - supports-color
     dev: false
 
+  /koa2-formidable/1.0.3:
+    resolution: {integrity: sha512-m80sje/vb4mvhZn7HbZPwYHnsGjKL+oJ4OasNbH+jdvjIddVMPmugmmBwPnMYDGaMnL0tT9mJrfKRcp8MMdNyQ==}
+    dependencies:
+      formidable: 1.2.6
+    dev: false
+
   /ky-universal/0.10.1_ky@0.30.0:
     resolution: {integrity: sha512-r8909k+ELKZAxhVA5c440x22hqw5XcMRwLRbgpPQk4JHy3/ddJnvzcnSo5Ww3HdKdNeS3Y8dBgcIYyVahMa46g==}
     engines: {node: '>=14'}