transfer a file over LAN

I have a laptop, desktop and a router (which also handles the Internet connection)

I’ve got a huge file in my laptop. I’d like to transfer this file to my desktop.

The file exceeds the max file size limit in my portable FAT32 external hard disk, so I can’t use that method.

The simpler the better. Thanks

depends on the filetypes on desktop/laptop.You could use ssh,ftp,smb,nfs,fish. The list is exhaustive & depends on if you want to set up filesharing permanently

Andy