Play videos with no layout and only assign to group?

As the title asks, is there a way that I can just assign the file to the display group and have it play that file without the need for a layout? Or is a layout required? If it is maybe I miss the point of assigning files lol, the description says it is to cache the files locally but I thought that the players did that already anyways when you assign a layout?

It does need a layout and as you say player will download and cache video files that way too.

Assigning files to displays / display group in most cases is not needed and not recommended.

There are however cases when it’s useful, for example automatic upgrades via CMS on rooted android devices (when you assign .apk as generic file)