My current plan is to use SyncThing on the phones and on a linux PC. I’ve set up Obsidian to use a directory locally on the phone (Open Folder As Vault) and use SyncThing to sync that with the PC. As this is only a recent test, I’m still using resilio to sync that dir to other PCs such as my laptop. I just added to a note on my phone and it appeared in Obsidian on my laptop a few seconds later, despite two different syncs being involved.
I’d commented about bugs such as the sync percentage being stuck at 91%, but on reading up on it more, that’s due to a mis-match of ignored files (the ignore patters were the same, but it was still indicating that the files did not match between the two devices).
So my thoughts still stand that SyncThing has a lot of things to set up manually (e.g. it doesn’t automaticall sync between all peers) and the mobile app is strange for having two different UIs, but it looks like as I understand it better I’m happier to keep using it.
If I find that the Resilio phone app is better on battery life, I might switch back to that because I use resilio everywhere else and it’s simpler to set up (and I like that it archives old versions of files for a while).