Hi Tina
I have a similar problem to that of Daniel. I had participated in the AppStudio 3 beta program and then installed your latest version of AppStudio (see below screen shot)
I then downloaded the MapViewer template from AppStudio and tried to view non-public offline MMPKs that include rasters. The MMPKs with rasters would show in the thumbnails of the galley section, and I could download them onto device, but as soon as I try and open them I get a message "Attempt to use functionality that is not supported fo ...." See below.
I was able to view your example MMPK (tiff1 = 1dd590f38fc14840b7917febe7344791) in a MapViewer once, but as soon as I added secured MMPKs, and activated "Supported secured maps" under settings, I was unable to view even your public MMPK (I would receive the above error). I tried to undo my settings and remove the secured MMPKs from the gallery, but still I could not view your MMPK.
Is the failure to view secured MMPKs with rasters by design, a bug, human error, or wrong version of runtime?
You have referred to " ..enhancements added to ArcGIS Runtime 100.2 and 100.2.1 ". If I open the MapViewerApp.qml, then I see I am importing Runtime 100.2 not 100.2.1 (see below). Should I not need to upgrade to 100.2.1 or is this implicit in AppStudio 3?
/* Copyright 2017 Esri
etc
import QtQuick 2.7
import QtQuick.Controls 2.1
import QtQuick.Controls.Material 2.1
import ArcGIS.AppFramework 1.0
import ArcGIS.AppFramework.Promises 1.0
import ArcGIS.AppFramework.Authentication 1.0
import Esri.ArcGISRuntime 100.2
import "controls" as Controls
import "views" as Views