[anderspitman]

I think our thread got too deep and it won't let me reply. Feel free to contact me directly through https://apitman.com or post on https://forum.indiebits.io if you want to talk more.

But to answer your question, you'll need to run a CLI daemon on your grandma's computer. Something like ngrok static files would probably be the easiest:

https://ngrok.com/docs#http-file-urls

But since you're already setting up one daemon in that case, I'd use Cloudflare Tunnel and also run a basic webserver or WebDAV server alongside it to give you more control over how the files are hosted.

Also pretty sure you have to pay for custom domains with ngrok.