I recently decided to remove the Explorer App from our Android tablets and smart phones and utilize Field Maps for reviewing Mobile Map Packages. Unfortunately, in all cases with the available build for Field Maps (7/21/2021), Mobile Map Packages crash Field Maps. In some cases Field Maps just blips out when you activate it, in other cases (tablets in particular), the map package will load and function ok for a while unless the user tries to navigate or pan the window just after opening the mobile map package.
At this junction, we have discontinued use of Field Maps for Mobile Map Packages and reverted back to the Explorer App (Android). This issues has not been tested for iOS.