Using Envato element assets for youtube videos.

Hi, I have a few questions.
(1) Suppose I downloaded an image or a video from elements. My youtube video has 50-100 images or videos and I talk in the video. Can I use the videos and images which I downloaded from elements in my youtube videos again and again or I have to register a new license every time I produce a new video? I do not produce videos which belong to one series. Each video is different.
(2) I have multiple youtube channels so can I use element assets or not because I will be using these in different videos on different channels ?

Yes if it’s not part of the same series, you would need to download again.

If the video is the same, it doesn’t matter which channel it’s on.