Ad platforms your creative may be launched on requires a tight 1% tolerance on ad placements
The general recommendation is that your 9:16 videos are 1080 pixels wide by 1920 pixels high, your 1:1 videos are 1080 pixels wide and high, and your 4:5 videos are 1080 pixels wide by 1350 pixels high
A common issue we’ve seen is that a 1920×1080 is not a 9:16 aspect ratio video but actually a 16:9 aspect ratio