Can't modify video cover when file is on NAS
Got my videos on a Synology NAS (DS213j).
In iTunes i can't modify the video cover of these files.
When having the same file on a local drive (e.g. desktop) any modification is possible.
Where to look at?
Any hints appreciated.
-Peter
iMac, OS X El Capitan (10.11.3), iTunes, NAS, Synology