I think i have to add that i have write permissions with the unRAID server.
The problem is the share for Windows computers.
I can read the share mount of Dropbox /mnt/user/unRAIDand/Dropbox and copy from it.
I can write to the unRAID share /mnt/user/unRAID where the Drobox share is mounted.
Reverting back to 6.9.2 and i can read/write to /mnt/user/unRAIDand/Dropbox just fine.