I’m not familiar with Clips, however- it sounds to me like you need to be using the IMovie app, for the project/video you are trying to create. When you open IMovie and click on the + it will allow you to upload videos and pictures in order to create either a movie or “Hollywood style” trailer. It also allows you to edit your videos as you wish, thus combining whatever you want to merge! Hope this helps. I’m no professional, and have limited use with this app- but I can positively state, that it does allow you to import your pictures and videos (which seems more helpful than where you are getting with Clips)! 😁. Good Luck!