I've been using Writer+ on Android that I have setup to Resilio sync to my Raspberry Pi.

The Raspberry Pi has a script I wrote that runs GIT every minute to check for changes and commit them if so.

I also Resilio sync this to any desktop I need and use a Markdown editor called "MarkdownPad" on Windows.

With this setup I have version control running all the time from a 'server' I control and have the ability to view and edit my notes on my phone and desktop using a format that is never going away.

Just thought I would post this in case someone wanted to try the same thing.