If the photos on the phone are visible as files on a mounted filesystem, you can use rsync to copy them. If the connection drops but recovers by itself, you can

If the photos on the phone are visible as files on a mounted filesystem, you can use rsync to copy them. If the connection drops but recovers by itself, you can put rsync inside a while true loop until it’s doing nothing. I’m using Dropbox for syncing photos from phone to Linux laptop, and mounting the SDcard locally for cameras, so this is a guess.