I’m experiencing the same problem, which has persisted for months. (Referring to: Sync issues (Iphone / Ipad or even Android))
I’m eagerly awaiting the push sync solution that Jeff mentioned. If a solution isn’t provided, I’ll unfortunately have to purchase an AI board from a different brand and switch over. For me, the best way to learn is through instant review, and without that functionality, this board loses much of its value.
This issue should be a top priority for ChessUp, even warranting a hotfix in the current version.
Note: Strangely, sometimes matches sync again and I can review them, but then after a moment, they’re gone and the bug reappears.