I have exactly the same error!
I have 2 USB flash drives mounted with various files and one storage system mapped from my local network as 10.10.xxx.x as backup system.
I can open files from those mounted flash drives or storage system, but I can't save the files to them.
I can only save files to local drive. So I have to do a copy to the mounted file systems after I saved it.
Sheila
I have exactly the same error!
I have 2 USB flash drives mounted with various files and one storage system mapped from my local network as 10.10.xxx.x as backup system.
I can open files from those mounted flash drives or storage system, but I can't save the files to them.
I can only save files to local drive. So I have to do a copy to the mounted file systems after I saved it.
Sheila