Maybe you need to configure the nfs persmissions.
have a look at this → https://kodi.wiki/view/NFS#Synology_DSM_5.1
I used this excellent guide Configuring fstab based NFS share mounts
Maybe you need to configure the nfs persmissions.
have a look at this → https://kodi.wiki/view/NFS#Synology_DSM_5.1
I used this excellent guide Configuring fstab based NFS share mounts