i have the same exact problem than:
from the editor, my maps are read only.
but i can modify the conf files with putty. (which is a bit tedious)
i tried the given solution, but the problem remains.
[OK] Composer Version: 1.8.5
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct
Did you ever solve this?
I have exact same problem. Cannot edit files (read-only) Permissions are as recommended by documentation
What i did was to change ownership of the file .conf as
-rw-r–r-- 1 www-data librenms
Now i can both edit and view