Nextcloud running in VM in Proxmox - Moving data directory

I am 100% new to Nextcloud, and I would like to use it for Photo backups from my phone instead of Google cloud storage, which already has filled up.

I found this older thread: How to move data directory after install

But it has a dropdown that says:

" Note that this HowTo does not apply to Nextcloud containers/appliances or the official Nextcloud VM from Hansson IT.

I am running this setup on a NUC with attached USB storage which I already have passed thru to the OMV VM and was hoping that I could do the same with Nextcloud but I can not find any good information or videos on setting it up so that the photos are automatically uploaded to the attached storage.

I am hoping someone can point me in the right direction.

Thank you for reading.