Can I use pico-cms to see a formatted html file? Or does pico-cms only work with markdown files?
You can include HTML in your Markdown files - as long as the included HTML doesn’t include active content like HTML forms or JavaScript. You can’t serve .html files with Pico CMS for Nextcloud. However, you won’t need any app to access .html files anyway, simply upload them to your webserver and use the files_external app to include the folder it in your Nextcloud (even though this solution has nothing to do with Pico CMS for Nextcloud).