diff --git a/packages/backend/src/core/DriveService.ts b/packages/backend/src/core/DriveService.ts
index 0409a4f53..891be4611 100644
--- a/packages/backend/src/core/DriveService.ts
+++ b/packages/backend/src/core/DriveService.ts
@@ -87,6 +87,9 @@ type UploadFromUrlArgs = {
 
 @Injectable()
 export class DriveService {
+	public static NoSuchFolderError = class extends Error {};
+	public static InvalidFileNameError = class extends Error {};
+	public static CannotUnmarkSensitiveError = class extends Error {};
 	private registerLogger: Logger;
 	private downloaderLogger: Logger;
 	private deleteLogger: Logger;
@@ -650,15 +653,15 @@ export class DriveService {
 	}
 
 	@bindThis
-	public async update(file: MiDriveFile, values: Partial<MiDriveFile>, updater: MiUser) {
+	public async updateFile(file: MiDriveFile, values: Partial<MiDriveFile>, updater: MiUser) {
 		const alwaysMarkNsfw = (await this.roleService.getUserPolicies(file.userId)).alwaysMarkNsfw;
 
 		if (values.name && !this.driveFileEntityService.validateFileName(file.name)) {
-			throw new Error('invalid filename');
+			throw new DriveService.InvalidFileNameError();
 		}
 
 		if (values.isSensitive !== undefined && values.isSensitive !== file.isSensitive && alwaysMarkNsfw && !values.isSensitive) {
-			throw new Error('cannot unmark nsfw');
+			throw new DriveService.CannotUnmarkSensitiveError();
 		}
 
 		if (values.folderId != null) {
@@ -668,7 +671,7 @@ export class DriveService {
 			});
 
 			if (folder == null) {
-				throw new Error('folder-not-found');
+				throw new DriveService.NoSuchFolderError();
 			}
 		}
 
diff --git a/packages/backend/src/server/api/endpoints/drive/files/update.ts b/packages/backend/src/server/api/endpoints/drive/files/update.ts
index c9e2d7464..c01f3de03 100644
--- a/packages/backend/src/server/api/endpoints/drive/files/update.ts
+++ b/packages/backend/src/server/api/endpoints/drive/files/update.ts
@@ -89,14 +89,28 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				throw new ApiError(meta.errors.accessDenied);
 			}
 
-			const fileObj = await this.driveService.update(file, {
-				folderId: ps.folderId,
-				name: ps.name,
-				isSensitive: ps.isSensitive,
-				comment: ps.comment,
-			}, me);
+			let packedFile;
 
-			return fileObj;
+			try {
+				packedFile = await this.driveService.updateFile(file, {
+					folderId: ps.folderId,
+					name: ps.name,
+					isSensitive: ps.isSensitive,
+					comment: ps.comment,
+				}, me);
+			} catch (e) {
+				if (e instanceof DriveService.InvalidFileNameError) {
+					throw new ApiError(meta.errors.invalidFileName);
+				} else if (e instanceof DriveService.NoSuchFolderError) {
+					throw new ApiError(meta.errors.noSuchFolder);
+				} else if (e instanceof DriveService.CannotUnmarkSensitiveError) {
+					throw new ApiError(meta.errors.restrictedByRole);
+				} else {
+					throw e;
+				}
+			}
+
+			return packedFile;
 		});
 	}
 }