Video won’t save after exporting on iPad

Just spent 4 hours editing a video. It exports to 100% and then gives my options to save. I click save video and then the prompt disappears. Video doesn’t save. I did it twice and both times nothing happens after I click save video. I closed the app, reopened after the first time. Not sure what to do at this point.

I was capable of air dropping it to my iPhone. The prompt window stayed open after successfully air dropping. Tried to save video again, and still nothing.