[Mobile] Video making has constant issues

I've spent hours creating a project with videos and pictures, which was fairly easy to do. However, once I play with project, the pictures are blurry (I have to pause on every picture and tap it in order for it to become clear) and my videos will not play. For hours it’s been telling me that some media is still loading and to try again later. Not a single video in my project will play. I’ve wasted an entire day creating something I cannot use.