Step 1: Export your video from Premiere and optimize it for YouTube settings (be sure to make note of the location you save to and identify your group in the filename). Quick tutorial: https://www.youtube.com/watch?v=x6cv8kwNXUc&nohtml5=False
Step 2: Take the file you just saved and attach it to a new Gmail message. Gmail will automatically upload it to Drive.
Step 3: Address the message to both email@example.com and firstname.lastname@example.org. When prompted, send your message. Click “Share & Send” in the message that pops up.