...
The Download Basemaps tool uses Esri’s base map services and specifically the export image endpoint. For some reason, Esri decided to set the maxScale parameter within the TPKs it produces. While we have suggest suggested that this is not the expected or desired behavior, that setting persists. This means that if you selected zoom level L15 when downloading the base map, the image completely disappears (won’t display) when you zoom to level 16 or greater. There is a workaround (see below), but it is complex and can’t be completed within MobileMap. Where possible, try to zoom in to as small of an extent as possible, and select a zoom level that meets your needs in the field (e.g., L16). In our experience, downloads greater than 100MB are seldom successful, so you may need to accept a lower zoom level, or break your base map into multiple smaller extent base maps.
...