diff --git a/packages/backend/src/models/repositories/drive-file.ts b/packages/backend/src/models/repositories/drive-file.ts
index 69dc1721c..c15f5b605 100644
--- a/packages/backend/src/models/repositories/drive-file.ts
+++ b/packages/backend/src/models/repositories/drive-file.ts
@@ -1,6 +1,5 @@
 import { db } from '@/db/postgre.js';
 import { DriveFile } from '@/models/entities/drive-file.js';
-import { Users, DriveFolders } from '../index.js';
 import { User } from '@/models/entities/user.js';
 import { toPuny } from '@/misc/convert-host.js';
 import { awaitAll, Promiseable } from '@/prelude/await-all.js';
@@ -9,6 +8,7 @@ import config from '@/config/index.js';
 import { query, appendQuery } from '@/prelude/url.js';
 import { Meta } from '@/models/entities/meta.js';
 import { fetchMeta } from '@/misc/fetch-meta.js';
+import { Users, DriveFolders } from '../index.js';
 
 type PackOptions = {
 	detail?: boolean,
@@ -111,7 +111,40 @@ export const DriveFileRepository = db.getRepository(DriveFile).extend({
 
 	async pack(
 		src: DriveFile['id'] | DriveFile,
-		options?: PackOptions
+		options?: PackOptions,
+	): Promise<Packed<'DriveFile'>> {
+		const opts = Object.assign({
+			detail: false,
+			self: false,
+		}, options);
+
+		const file = typeof src === 'object' ? src : await this.findOneByOrFail({ id: src });
+
+		return await awaitAll<Packed<'DriveFile'>>({
+			id: file.id,
+			createdAt: file.createdAt.toISOString(),
+			name: file.name,
+			type: file.type,
+			md5: file.md5,
+			size: file.size,
+			isSensitive: file.isSensitive,
+			blurhash: file.blurhash,
+			properties: opts.self ? file.properties : this.getPublicProperties(file),
+			url: opts.self ? file.url : this.getPublicUrl(file, false),
+			thumbnailUrl: this.getPublicUrl(file, true),
+			comment: file.comment,
+			folderId: file.folderId,
+			folder: opts.detail && file.folderId ? DriveFolders.pack(file.folderId, {
+				detail: true,
+			}) : null,
+			userId: opts.withUser ? file.userId : null,
+			user: (opts.withUser && file.userId) ? Users.pack(file.userId) : null,
+		});
+	},
+
+	async packNullable(
+		src: DriveFile['id'] | DriveFile,
+		options?: PackOptions,
 	): Promise<Packed<'DriveFile'> | null> {
 		const opts = Object.assign({
 			detail: false,
@@ -145,9 +178,9 @@ export const DriveFileRepository = db.getRepository(DriveFile).extend({
 
 	async packMany(
 		files: (DriveFile['id'] | DriveFile)[],
-		options?: PackOptions
-	) {
-		const items = await Promise.all(files.map(f => this.pack(f, options)));
-		return items.filter(x => x != null);
+		options?: PackOptions,
+	): Promise<Packed<'DriveFile'>[]> {
+		const items = await Promise.all(files.map(f => this.packNullable(f, options)));
+		return items.filter((x): x is Packed<'DriveFile'> => x != null);
 	},
 });
diff --git a/packages/backend/src/models/repositories/page.ts b/packages/backend/src/models/repositories/page.ts
index 1bffb23fa..092b26b39 100644
--- a/packages/backend/src/models/repositories/page.ts
+++ b/packages/backend/src/models/repositories/page.ts
@@ -1,10 +1,10 @@
 import { db } from '@/db/postgre.js';
 import { Page } from '@/models/entities/page.js';
 import { Packed } from '@/misc/schema.js';
-import { Users, DriveFiles, PageLikes } from '../index.js';
 import { awaitAll } from '@/prelude/await-all.js';
 import { DriveFile } from '@/models/entities/drive-file.js';
 import { User } from '@/models/entities/user.js';
+import { Users, DriveFiles, PageLikes } from '../index.js';
 
 export const PageRepository = db.getRepository(Page).extend({
 	async pack(
@@ -14,7 +14,7 @@ export const PageRepository = db.getRepository(Page).extend({
 		const meId = me ? me.id : null;
 		const page = typeof src === 'object' ? src : await this.findOneByOrFail({ id: src });
 
-		const attachedFiles: Promise<DriveFile | undefined>[] = [];
+		const attachedFiles: Promise<DriveFile | null>[] = [];
 		const collectFile = (xs: any[]) => {
 			for (const x of xs) {
 				if (x.type === 'image') {
@@ -73,7 +73,7 @@ export const PageRepository = db.getRepository(Page).extend({
 			script: page.script,
 			eyeCatchingImageId: page.eyeCatchingImageId,
 			eyeCatchingImage: page.eyeCatchingImageId ? await DriveFiles.pack(page.eyeCatchingImageId) : null,
-			attachedFiles: DriveFiles.packMany(await Promise.all(attachedFiles)),
+			attachedFiles: DriveFiles.packMany((await Promise.all(attachedFiles)).filter((x): x is DriveFile => x != null)),
 			likedCount: page.likedCount,
 			isLiked: meId ? await PageLikes.findOneBy({ pageId: page.id, userId: meId }).then(x => x != null) : undefined,
 		});
diff --git a/packages/backend/src/remote/activitypub/models/mention.ts b/packages/backend/src/remote/activitypub/models/mention.ts
index a16009296..13f77424e 100644
--- a/packages/backend/src/remote/activitypub/models/mention.ts
+++ b/packages/backend/src/remote/activitypub/models/mention.ts
@@ -1,9 +1,9 @@
-import { toArray, unique } from '@/prelude/array.js';
-import { IObject, isMention, IApMention } from '../type.js';
-import { resolvePerson } from './person.js';
 import promiseLimit from 'promise-limit';
-import Resolver from '../resolver.js';
+import { toArray, unique } from '@/prelude/array.js';
 import { CacheableUser, User } from '@/models/entities/user.js';
+import { IObject, isMention, IApMention } from '../type.js';
+import Resolver from '../resolver.js';
+import { resolvePerson } from './person.js';
 
 export async function extractApMentions(tags: IObject | IObject[] | null | undefined) {
 	const hrefs = unique(extractApMentionObjects(tags).map(x => x.href as string));
@@ -12,7 +12,7 @@ export async function extractApMentions(tags: IObject | IObject[] | null | undef
 
 	const limit = promiseLimit<CacheableUser | null>(2);
 	const mentionedUsers = (await Promise.all(
-		hrefs.map(x => limit(() => resolvePerson(x, resolver).catch(() => null)))
+		hrefs.map(x => limit(() => resolvePerson(x, resolver).catch(() => null))),
 	)).filter((x): x is CacheableUser => x != null);
 
 	return mentionedUsers;
diff --git a/packages/backend/src/server/api/endpoints/drive/files/find-by-hash.ts b/packages/backend/src/server/api/endpoints/drive/files/find-by-hash.ts
index f9b4ea89e..0b74cb9f0 100644
--- a/packages/backend/src/server/api/endpoints/drive/files/find-by-hash.ts
+++ b/packages/backend/src/server/api/endpoints/drive/files/find-by-hash.ts
@@ -1,5 +1,5 @@
-import define from '../../../define.js';
 import { DriveFiles } from '@/models/index.js';
+import define from '../../../define.js';
 
 export const meta = {
 	tags: ['drive'],
diff --git a/packages/backend/src/server/api/endpoints/drive/files/show.ts b/packages/backend/src/server/api/endpoints/drive/files/show.ts
index a2bc0c7aa..fb19345fe 100644
--- a/packages/backend/src/server/api/endpoints/drive/files/show.ts
+++ b/packages/backend/src/server/api/endpoints/drive/files/show.ts
@@ -1,7 +1,7 @@
-import define from '../../../define.js';
-import { ApiError } from '../../../error.js';
 import { DriveFile } from '@/models/entities/drive-file.js';
 import { DriveFiles, Users } from '@/models/index.js';
+import define from '../../../define.js';
+import { ApiError } from '../../../error.js';
 
 export const meta = {
 	tags: ['drive'],
@@ -51,7 +51,7 @@ export const paramDef = {
 
 // eslint-disable-next-line import/no-default-export
 export default define(meta, paramDef, async (ps, user) => {
-	let file: DriveFile | undefined;
+	let file: DriveFile | null = null;
 
 	if (ps.fileId) {
 		file = await DriveFiles.findOneBy({ id: ps.fileId });