Is there a program to upload files to the server?

Question

FTP

Good afternoon! Is there software for uploading files to the server, it is important that you do not have to enter a login / pass like this is already generated automatically and the client does not need to know. For him, only two things are important - attach files and send.
It's like litemanager or teamviewer, which has a server side and a client side. Thank you.