Not trying to plug myself, but I’ve been working on a similar project for this exact reason. It doesn’t use special file types. Just HTML and localStorage proxi

Not trying to plug myself, but I’ve been working on a similar project for this exact reason. It doesn’t use special file types. Just HTML and localStorage proxies to sync devices. It’s self-hostable too. I’ve got a bunch of super niche todo lists and personal apps running on my home server with it. https://github.com/momja/Exhibit https://github.com/momja/Exhibit