Nextcloud Snap - Data Directory on synology share


my target is to use the nextcloud snap with the nextcloud data directory on an synology share.

Unfortunately I am a linux newbie.

I installed Nextcloud snap on Ubuntu 18.04.02. LTS the following way:

Installation Nextcloud:

sudo snap install nextcloud
sudo snap connect nextcloud:removable-media

Mount Synology to /media/nextcloud/next-02:

sudo gedit /etc/fstab

//ds-001/nextCloud/next-02 /media/nextcloud/next-02 cifs defaults,uid=1000,username=,password=

Change Data Directory to synology share:

Now I get “Your data directory is not writable”.

Maybe it is not possible because of security restrictions of the snap environment?

Thanks in advance.
Regards, Jonas