I have created a .story file and quickly realized that the 500Mb .story file was becoming too big to work with. So I split the file into two scenes by duplicating the file and deleting the slides. I deleted unused video in the Screen Recordings and I hoped that the files would be two 250Mb .story files. Instead I have two 500Mb .story files. Is there a way to delete or cleanup the unused media that seems stuck in the file?