Android 14, an update released on 22 June under no more description than 'security update' has stopped syncthing being able to write to folders, even the few it allowed me to previously specifically grant access to. I can't add a folder to sync, as it says 'your android version hasn't granted syncthing write access, this folder is locked to read only' and then doesn't even add it.
My specific model, moto g73 doesn't support root or custom ROMs, which I wasn't aware of when I got it, but I have it now and apart from that it's a really good phone, so I hope there is some way to rescue this.
I should have the option to decline their 'security', even if it is buried under many layers of settings, and grant the apps storage permission anyway. Otherwise it is not security, it is them stealing ownership of my device from me.
It should absolutely be Motorola's onus to fix this, not the hardworking Syncthing team, but if you do know some way to get this working again, I would be grateful.
EDIT: Oh, by the way, this update also stopped every file manager app I had, of which I had three, one being the native Android file manager itself, working properly.
Edit2: This only seems to apply to the micro SD card storage, not internal storage. Unfortunately, I've filled up my internal storage and need to use my micro SD card. I was using Syncthing as a backup, so I had a copy in case the micro SD card corrupted everything.