I've done a couple of test and when I share a map with Hillshade blended (multiply) on basemap, it's not working on mobile view.
Someone have the same issue?
I have experienced the same issue with blended basemaps appearing correctly in the web Map Viewer, but one basemap being completely hidden in the mobile app. I would be eager to hear a solution; for now I have resorted to increasing the transparency of one layer.