can elaborate?
in the internet?
to a friend?
in gbatemp?
well, in gbatemp you can attach a file to a thread (warez like game roms are not allowed) there are buttons that say "upload a file" and even in the top right corner there is a button for the gbadownload center which i never used lol
not sure if you need a minimum number of files
to upload a file to the internet you can use plenty of file host services, filetrip is one of them, there are plenty of others which i can't reccomend.
you can as well use a cloud service like a google drive or dropbox and create a link to share that file