Why is the ParseFilePipe validation not working as intended in my nestjs api route?

Question

First Problem (Max File Size) I've set the max file size 2MB but I still get error even when I uploaded an image that is few kbs in size. The code:

  @Patch()
  @UseGuards(AuthGuard)
  @UseInterceptors(
    FileFieldsInterceptor([
      { name: 'avatar', maxCount: 1 },
      { name: 'cover', maxCount: 1 },
    ])
  )
  async update(
    @Request() req,
    @Body(new ValidationPipe({ transform: true, whitelist: true }))
    updateProfileDto: UpdateProfileDto,
    @UploadedFiles(
      new ParseFilePipe({
        fileIsRequired: false,
        validators: [
          new MaxFileSizeValidator({
            maxSize: 2 * 1024 * 1024,
            message: 'File is too large. Max size is 2MB',
          }),
        ],
        errorHttpStatusCode: HttpStatus.UNPROCESSABLE_ENTITY,
      })
    )
    files
  ) {
    console.log('files', files);
  }

PATCH Request Using Postman. URL: http://localhost:5984/api/profile Attached image in form-data tab.

The Response I get:

{
    "path": "/api/profile",
    "statusCode": 422,
    "message": [
        "File is too large. Max size is 2MB"
    ],
    "success": false
}

Second Problem (File Type Validation)

When uploading a .png image.

{
    "path": "/api/profile",
    "statusCode": 422,
    "message": [
        "Validation failed (expected type is .(png|jpeg|jpg))"
    ],
    "success": false
}

I tried using ParseFilePipeBuilder instead of ParseFilePipe, but no difference. For file type validation, I tried setting the fileType as image/png, png, .png etc. Please let me know if I missed to attach any other information in this post.