Failing to sync linux with android

[xduugu]

In short: external storage is not fully writable.

Your options:

Sync working on SD card but only one folder deep?

There are three possibilities to use the external SD card without root as far as I know: adoptable storage folders in the apps “area” (don’t know how it is called), e.g. /storage/014A-7323/Android/data/com.nutomic.syncthingandroid/files Master folders (as long as you create the .stfolder file manually) Maybe, Phone-pictures is a Master folder.