Add videos and photos with Upload file (MP4/MOV up to 100 MB, photos up to 10 MB, stored on Cloudinary; up to 25 MB if Cloudinary isn't connected). YouTube links work too. Instagram links and embed code work too. Pick a category for each (set them up in the Categories tab). Click Save changes when done.
Each category is a folder when someone clicks Watch. Folders show in this order (use ↑ ↓), and only when they have items. Renaming a category keeps its items; deleting one moves its items to "Other".