In telegram API documentation I see: "You can either pass a file_id as String to resend a photo that is already on the Telegram servers", but I can't find ways to get file_id of uploaded file. How can I get it?
Its depended to your content_types ,for example:
Video:
message.video.file_id
Audio:
message.audio.file_id
Photo:
message.photo[2].file_id
For more see this link.