Haven't played with start9 setups. But anything Linux based you can run containers on safely you should be good! 

 Check some of these projects out, there are a couple I recommend. I'm working on a backburner tool myself, but its for all kind of media - blogs, file hosting, podcast episodes + rss feeds. It's not production ready yet though. 

https://github.com/awesome-selfhosted/awesome-selfhosted?tab=readme-ov-file#file-transfer---single-click--drag-n-drop-upload 

 Thanks