Thank you for your help! It’s finally sorted out and been working as I’d hoped it would for the past couple of days. The documentation is good. And the forum members here super helpful so thank you.
Resolution was due to a few things: failed transfers creating several thousand .syncthing.*.tmp files. Changing the “keep temporaries (hours)” value under the advanced->options menu to 2 and doing a rescan cleared them all out, and then the files started to sync again. I’ve shortened the duration on all my devices from 24 to 6 now across the board.
The nesting of sync folders was also the cause of some issues - resolved in another thread: complex sync structure - bad? - #8 by tiwing … excellent advice and help over there too.
Really appreciate the assistance getting this set up.
Cheers