Adobe Express

Animation does not work properly. My text boxes are not re-centering when they swoop in. Also I got a a white rectangle on the edge of my art when it was converted to an MP4 with the animation. The resulted mp4 is not worthy of using in a social media posting. I have low confidence in the premium product that I will purchase the premium if this is how the product will behave. Please take a look at my mp4 and let me know if I did something wrong? Thanks.