Not home so I can’t try it but do you need to be so specific to match the whole markdown syntax?

You might be able to get away with

s/#(\w+%20)*\w+\.\w{2,3}/\L&/g; /#(\w+%20)*\w+\.\w{2,3}/ s/%20/-/g

basically, matching #this%20is%20LIKELY%20a%20link.md as opposed to matching whole markdown link

lowercasing that entire match, then on a search matching stuff that looks like that, replace the %20 with a hyphen (combined into a single sed command). this only fails when an http link falls within the same line as a markdown hyperlink

If there is going to be an apk release, will there be support for Android TV as well? Thanks for the hard work!