I store on a external hard drive. Up until recently, I have had no problems with editing or synching. I am on Release 12.01, on an Imac Version 11.7. I now get the following message, when I open Lightroom Classic:
'Lightroom cannot write to the following directories. Until this problem is resolved, synching from Lightroom may not function correctly.'
In addition to this message, I cannot use any presets. I can manually edit, but I am not able to synch.