If you're uploading your own videos, they need to meet a few requirements, so they look good in Meta's ad placements and don't get rejected at review.
Specs
How many to upload
We recommend at least a handful of variations (3+, 4-5 is ideal) so Meta has options to rotate through. The upload button will tell you when you've hit the cap (5). You can upload more once the ad is launched, or during the campaign, under the Link of your campaign, Ads tab, part Visuals.
Mixing with generated videos
By default, your uploads are combined with videos we generate from your Link's artwork and Spotify data. If you'd rather Meta serve only the videos you uploaded, there's an "only use my videos" toggle on the Creatives step.
Want to make your own instead of uploading?
Check out Ads Studio: a free in-browser video maker that handles the specs for you automatically.