When I try to add it, it just says Add Set and the screen is blank.
Also, I restored purchases, but it still didnt recognize my premium from years ago. So I bought it again for $2.99 (I am using the Pro app)
Still cannot add exercises to an existing workout.
I’m so sorry. Which phone are you using?
If it’s not asked too much, could you supply a screen recording of the bug? This would help us tremendously. It’s super easy, check out apple’s explanation on how to record your screen.
Thank you 
Yes, I can do a screen recording. I am using iPhone X but also iOS 13 beta.
how do I attach the video to this message?