thumb: Optional[Union[aiogram.types.input_file.InputFile, str]]
Thumbnail of the file sent; can be ignored if thumbnail generation for the file is supported server-side. The thumbnail should be in JPEG format and less than 200 kB in size. A thumbnail’s width and height should not exceed 320. Ignored if the file is not uploaded using multipart/form-data. Thumbnails can’t be reused and can be only uploaded as a new file, so you can pass ‘attach://’ if the thumbnail was uploaded using multipart/form-data under .