Audio but no video for downloaded footage
I am working on a little project where I am using video footage downloaded from WhatsApp. While other video that I uploaded for the project from my camera plays back fine, the footage that I downloaded will not play back smoothly in Premiere. I exported a small sample of the footage and it plays back fine when exported, but I just cannot see what I am editing. If I click through it on the clip viewer, it will pause for 5-10 seconds but it will eventually show the correct frame. I'm wondering if the image size has anything to do with it since it is such a low resolution (480p) but that's my only guess right now.
Thank you!