You can import any URL <x id="START_LINK" ctype="x-a" equiv-text="<a>"/>supported by youtube-dl<x id="CLOSE_LINK" ctype="x-a" equiv-text="</a>"/> or URL that points to a raw MP4 file. You should make sure you have diffusion rights over the content it points to, otherwise it could cause legal trouble to yourself and your instance.
Congratulations, the video behind <x id="INTERPOLATION" equiv-text="{{ targetUrl }}"/> will be imported! You can already add information about this video.
Image that will be merged with your audio file. <x id="LINE_BREAK" ctype="lb" equiv-text="<br/>"/> The chosen image will be definitive and cannot be modified.