Replace with After Effects composition doesn't open MP4 files
Ok so this may have already been answered somewhere out there but i cannot find the answer!!
Ive cut some clips on premier pro, when i highlight them ( 2 clips) and move them over to after effects with the 'render and replace with after effects composition,' it opens but with 2 compositions with the edits instead of mp4 files, not allowing me to toggle the motion blur effect i need. Any advice would be appreciated!!

guy on youtube does the exactly the same steps as me but his opens like this:

