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it even has a decent Android client in F-droid, RCX. I just wish it supported SSHFS

RCX is approaching abandonware status (last release 2y ago). Round Sync is worth a look.

Thanks for the recommendation! I searched F-droid but found nothing, and then I realised it was probably.on Izzy

Or just use rclone from inside Termux.

Sure, but then it's not visible across the Android filesystem