So I am creating a year long project on iMovie and Airdrop the videos I use from my iPhone to my downloads on my Mac. I drag these movies into my project, but I want to delete them out of my downloads because my Mac is low on storage. Anytime I delete these movies out of my Downloads, iMovie says "the source movie" is missing. Does anyone know how to delete these videos and have them kept in my iMovie without having to export my ongoing project? Thanks!