Copying music files to a Pixel

I've got 200GB of music files and a 512GB Pixel 8 Pro, and I'd like to copy all that music to /sdcard/Music. rsync would appear to be an ideal means to do this as it would allow syncing of any changes made to my local library. However, it appears impossible. Here's the rsync command I've been trying, with my phone connected by USB cable to my Linux laptop:

rsync -avz --recursive --size-only --info=progress --verbose --omit-dir-times --no-perms --usermap=:1000 --groupmap=:1000  ~/Music/ '/run/user/1000/doc/1587bc07/Music/'

The result is a lot of:

rsync: [generator] failed to set times on "/run/user/1000/doc/1587bc07/Music/MyMusicTaste/IsAwesome/Track01.mp3": Operation not supported (95)

I'm out of ideas for rsync options at the moment. I also tried starting an FTP server on the phone via Solid Explorer, and copying files with Filezilla. This works, as long as Solid Explorer's FTP server keeps running (which it doesn't, despite permission to run in the background). Does anyone have any other suggestions? Ideally I could connect the phone via cable for the initial copy as rsyncing 200GB over the home network is a bit slow.