I noticed two hours ago that this community got access to Level 3 ads for Growth Boost.
I was always at Level 3 when ads rolled out a few weeks ago, but of course I couldn't upload anything. It was turned off for freemium communities.
But then I was checking on the new discovery categories, and noticed I now have access to uploading 6 ads. So I crafted 6 ads similar to what you get in a paid community, and uploaded them!!
Fingers crossed they stick. It's been two hours. Off to bed!!