Hi James. When zoomed all the way out to the home position, I can zoom in 8x on my phone when it's offline and another 6x when it has a cellular or wifi connection. It's possible that the last 6x zooms are not loading more data but overzooming as you describe. Either way, there is a lot of information there that I'm missing when it doesn't zoom in past the first 8x. Is there any way to turn on the overzoom when my device is offline?
Another thing that is going on is I have a vector layer that is zoom-limited in the map that the tile package was created from and it happens to appear at exactly the zoom level (8x) where the device will no longer zoom in when offline. Maybe this is a coincidence?
I'll check this thread periodically. For some reason, GeoNet does not send me email when there is a response to this thread even though I have that setup in my profile. Thanks!