Sorry for the delay, [@tom](https://social.huginn.uk/@tom). Here's the rsync command I use to sync music to my Pixel 6 mounted via mtp from a USB stick with my music etc on it (which is mounted as /media/neil/media/):<code>rsync --size-only --verbose --progress --omit-dir-times --no-perms --recursive --inplace --delete /media/neil/media/music "/run/user/1000/gvfs/mtp:host=Google_Pixel_6_12345ABC1234RX/Internal shared storage/Music"<br></code>
It fails with albums/songs with colons in the name; I think that's an mtp issue.