Another permission question

Hi,

I'm trying my best to setup Nextcloud on my mediaserver, but I cannot work out the permissions to my data folder.

My setup is as follows: proxmox server openmediavault VM with 8tb disk and nfs shares debian mediaserver with docker compose (including nextcloud docker)

the nfs share is set to 775. I linked it in my debian server through /etc/fstab. I can write to the folder without a problem.

In my docker compose file i linked /mnt/photos:/photos to the nextcloud container. When i login to my container i cannot write files to the folder.

When i change the share to 777, i can write files, but nextcloud setup stops and says my permissions are wide open, so it won't continue the setup.

I turn it back to other:read/execute and the container cannot write to the folder anymore.

What am i doing wrong?