Permission Problems for copied files from NAS
Sounds like a permission problem. I had a similar issue. Files created by one user in two groups (administrator &amp; user) on NAS were not being able to read by users only in the user group. I tried reseting ownership/permissions using File Station from DiskStation and did nothing. I figured something was wrong with root folder permissions on shared folder - and yes, they were owned by root and 777 chmod.

I've managed to fix this by:


On the Synology - control panel - win/mac/nfs - goto Mac File Serivce (AFP) and turn off Apply default UNIX permissions (Mac file services enabled) - root of your problem
log on to NAS via ssh, go to most root shared folder and do

chown -R nobody:users shared_folder/
chmod -R 755 shared_folder/



used info from here, here and here.