stonenoodles
https://www.pharmaceutical-technology.com/data-insights/inno...
Highlights:
* You can drag-and-drop plugins from other wikis you come across
* You can write own plugins and customise everything
* Hostable as a self-contained file (one index.html) and it builds itself (a quine)
* You can host it in Node if you want stand-alone note files
Still didn't figure out a good mobile workflow though.
Then you'd need a fronend capable mounting Storj and they seem to have pretty good documentation.
Again, unaffiliated, and not tested (yet)
Another alternative - pay google (https://one.google.com/about/plans) via a VPN in Turkey and you have 10TB for about 20USD a year. Make the files shared and there you go.
Oh and: I'm very sorry about what's happening in HK the last few years. I still hope the process is reversible.
Possibly I'm not the right audience, but a guide on how to get your current docker setup incorporated into your service might be useful for people wanting to give it a spin.