The laziest way to fix your issue is to chmod the shared directory to 777.

I would only suggest this if this is on a LAN and you are the only person using the different machines.

Debian. All day, everyday.

You are running the VMs headless right?

An AWS S3 bucket to sync important files off site. £1 a month.

Pi-Hole, Nextcloud, local storage and email are used constantly. All bring great improvements.

Ansible and Zabbix provide ‘support’ for these applications.

Media streaming is a ‘nice to have’ but not essential. Wireguard is seldom used but still very important.

Do some reading up on Immich. It might be suitable for your needs.