Export bar won't load

I Have this video that I spent time on editing. it is 1:30 long. when I try saving it to my camera roll, the export bar won't move at all, it is at 0%. I tried leaving it somewhat overnight, when I came back, it is still stuck at 0%. I refreshed the app a few times but it still won't work. I'm not sure if anyone else has this problem, but please try answering it!