I’m running Syncthing on my laptops and phone.
As u can see in thr picture, I get the error:
“insufficient space on disk for database” and the path is:
I have no idea how to get there,
what’s in there or why this folder has space issues; I have enough space in my internal disk (at least 2GB).
See the minDiskFree section in Syncthing’s documentation.
Syncthing’s default unit for “minDiskFree” is percent of volume size and a 1% threshold. So working backwards for a typical Android footprint (with A/B updates) and filesystem overhead, 0.85% free space remaining error means your phone’s internal storage is probably 256 GB.
Running out of storage could corrupt your Syncthing database, but if you’re willing to risk it, you could change the units from percentage to GB, MB, or even KB and then set a custom fixed size.
But as @tomasz86 already recommended, pruning unused apps and data is the better solution (a lot of apps have huge temporary data caches).