I tried to use https://gist.github.com/rugk/c564274d10bc359052cfbeb5acde22ca/raw/911e50ce910d787264bfd3594ae590b69f3b61a7/userstyle.css as a mirror URL, but the validation does not allow me to use that.
For this style: https://userstyles.world/style/26535/default-slug
- Browser: Firefox 147
- Screenshot:

- **Additional context**: I needed to check the source code and aaahhh I see. I need to write `.user.` in the filename/URL somewhere. This is not at all clear for new users, IMHO.
https://regex101.com/r/tbkXMu/1
I tried to use https://gist.github.com/rugk/c564274d10bc359052cfbeb5acde22ca/raw/911e50ce910d787264bfd3594ae590b69f3b61a7/userstyle.css as a mirror URL, but the validation does not allow me to use that.
For this style: https://userstyles.world/style/26535/default-slug