How to transfer Apps using Samsung Switch?

I am trying to use Samsung's "Smart Switch" to transfer apps from an old phone to a new phone (both Samsung S9's, both running Android v10). I followed the directions carefully but not all apps are *installed* on the new phone. In particular, apps I downloaded from the PlayStore were installed Ok, but none of my in-house-developed apps are installed. **Is this expected behavior?** Notes: 1. All apps were successfully *transferred* (I see them when I tap "Apps") but they weren't *installed*. **Am I out-of-luck?** 2. I *can* manually install my apps using Android Developer Studio, but I have a lot of them and that would be a real pain. 3. I tried a "chatting" with Samsung tech support but they were clueless. 4. Interestingly, when I tried this a few days ago, I got messages saying that the apps were designed for an older version of Android and asked "Install Anyway?". I always clicked YES but they still were not installed. I no longer am asked this.