Hi! Initially, this feature is not provided. But if you have certain knowledge of After Effects, you can try

This possibility is present, but as it will be in the end result – depends on many factors (video quality, video type, etc.)

I’d like to use your video template for a video montage. The short video clips, mostly taken with a mobile phone, are mp4 files.

I understood you. As you see in the preview, not all the image falls into the boundaries of ink. So you need to have this in mind.