Dave, or "Phineas" or "Tolstoy" or,
Mount Holly (Gastonia / Charlotte)
I've had the BGG Mobile App on my iPhone for years. I noticed there were some problems (errors) when I attempted to "Manage Collection" so I uninstalled with the plan to download again. The only thing I know for sure, is that there is no "official" BGG app. Whatever you found was a third-party app that has no official connection to BGG at all. (I hope I am right about that.)
But now I can't find the BGG app in the IOS AppStore. Was it removed? Is there a suitable replacement for viewing forums, reviews, images and searching for games and recording plays?