Terrible Experience

I make movies on my phone to upload them to YouTube. I export them to Camera Roll and I dont check because I thought it would be there. The next day I go to my camera roll and its not there. So I go to iMovie to export it again. When I go in it says: missing videos. The day before I deleted some videos but I didnt delete the ones. I needed because just in case. So it was searching for those certain videos and they werent found so somehow it deleted on its own which is the most annoying thing in the universe to me. So I might just, JUST MIGHT, switch to an android phone.

Sitania about iMovie, v2.2.3