I have syncthing set up on my laptop and phone. On my Android phone I use Markor for viewing and editing the files, and the changes are then synced back to my laptop.

Admittedly I don't use Markor very frequently, and often just use Evernote instead when I'm on my phone and want to jot down something quickly... This is mostly because I feel the need to organize in folders etc when using Markor and vimwiki, so my mental model of it includes a bit more friction compared to Evernote.