chore: modified file response dto

Author: apsantiso

src/modules/file/dto/file.dto.ts

@@ -6,7 +6,7 @@ import { FileStatus } from '../file.domain';
 export class FileDto {
   id: number;
   uuid: string;
-  fileId: string;
+  fileId?: string;
   name: string;
   type: string;
   size: bigint;

src/modules/file/file.usecase.ts

@@ -462,7 +462,9 @@ export class FileUseCases {
     ]);
 
     if (!limit || limit.value === '0') {
-      throw new PaymentRequiredException('You can not have empty files');
+      throw new PaymentRequiredException(
+        'You can not have empty files, upgrade your plan to get more features',
+      );
     }
 
     if (limit.shouldLimitBeEnforced({ currentCount: emptyFilesCount })) {