Hard stop prevent deletion of files regardless of APP used

Hello, latest photos app installed on nextcloud. I’m running a VM with nextcloud with a local windows array mounted from a windows server. It’s mounted in NC as local folder. I can access it in the NC file explorer, I can access it in photos app.

Photos app doesn’t have an option to disallow photo deletion and overrides any setting I set at the admin level in NC to make the entire folder read only.

Is there some way to make a global read only option?