Instagram Scheduler: Creating/Selecting A Reels Thumbnail Image

I'm looking to schedule a video Reel to an Instagram account and I'm seeing all the main elements, including "save draft",  "Post Now",  "Schedule", and "Preview", but I don't see an option to select or upload a thumbnail image for the Reel.

Has this feature been implemented or will we have to wait for a future update? What about the "Save Draft" feature? Will the draft be available to other Adobe Express collaborators on your team?

Thank in advance!