You can upload shorts from a PC or directly from your phone. When you open the application, find the '+' icon in the bottom center of the screen. Find the option for creating shorts. Once you see the shorts camera screen, you can edit the time and the speed. Add a filter if you like and get a recording. You can title it, add a description, and upload it to your channel when finished. Then, you sit back and wait for the likes, comments, and shares to roll in. Happy posting!