Me too i want to have a default for only crator can edit when you create a new doc.

I recommend HedgeDoc it is a web app only but works on mobile and desktop has grat Markdown support with images you can share certain documents even colaborate on one at the same thime and it is instantly “saved” so even if you trow your phone away right after you type one character it still will be synced and it has tags and a search funtion.

Maybe try OCserv for your VPN it is using https as a fallback and never failed me.

Maybe look at MeshCentral it is like TeamViewer just selfhosted and better.

Also the vault is en/de crypted on device so the code never sees your passwords