Post Series - Unable to upload video

When I select a series of posts to be created, I can only select images to upload from my computer, not mp4’s. However, I am able to upload the mp4’s from the gallery from previous posts. But this file also applies to every post in the series rather just being able to select one.

So the suggestion is to be able to select which post you want to add the image or video file to, but also allow you to upload an mp4 for the series from your computer and not just your gallery.