[Discontinued] Advanced Slides - Create markdown-based reveal.js presentations in Obsidian

Just started trying to learn advanced slides, very neat, but i have two questions i couldnt find in the documentation:

  1. on backgrounds a link sugests more options from the reveal.js but i dont understand how to translate/apply reveals syntax in the plugin. For example i got interested in the linear and radial gradients but all my blind attempts didnt work

  2. Is there any way to use a local external image as background? I mean outside of the vault. I know local images work with markdown syntax for embedding but couldnt figure out how to write for background

Also at least for me local images(not in the vault) arent rendering at all, neither on the preview nor the browser…