Video Format Error

I'm using Storyline 2 to house some videos, and I'm getting an error that says the format isn't supported when I try to insert it on a slide. It's occurring with two of the six videos, all of which are .mp4. The two problem videos are quite large, 2.68 GB and 2.50 GB. The other four videos are under 2 gigs, though some of them are over 1 GB. So, I'm not sure if the size is causing the error since the file type is support, or if the video files are somehow corrupted.

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