Advice needed.

Hello, I have a very cheap Asustor NAS for backup and a mini PC for Plex. I want to combine them into one server and use it for Plex, NAS and Immich (or other alternative). I'm on a budget. So my question is will this work for me and what software should I use? Dell optiplex 7050 SFF i5-7500T 8 or 16GB RAM