Video Preview doesn't work

If I set a video to:

Type: HTML5
Mime Type: video/mp4
Source: file:///home/username...videofile.mp4

Then I can see the video inside Bootstrap Studio, but not in the browser. It doesn't load! Is this a bug or am I doing something wrong?

Why are you making the source a local path on your computer? It should be a relative or absolute path to an online asset in order for the browser to load it. Upload your video to your webserver and then put the absolute path in as the source, and you will see the video in both BSS and in the browser preview.