Media replacement for MOGRT in Property Panel Does Not Work.

I don't render until I am finished adding all the elements to the MOGRT, since I always make adjustments. I create a new project and then adjust the sequence settings for the dimensions, and then I bring in the MOGRT and click on it in the timeline so it can take me to properties. Once there, I click on the element I want to change and click choose from finder, and click on the photo, and it shows up in the properties tab, but it disappears completely from the video/MOGRT itself.