Hello Jim,
- Add a video upload element from the Wix Editor to the page - like so
- There are two ways you can proceed now.
Either the way you are doing now using a URL and setting the src property to the URL for the item via code.
let url = $w('#dynamicRepeater).getCurrentItem().videoField;
$w('#uploadVideo').src = url;
PS. You would put this in the onDatasetReady event.
Or changing the field in the database to be of type video and connecting the video without code - like so
Best,
Majd

