I have the latest Collector App on Android 5.0 on a Samsung Galaxy S5. I will be heading to a remote wilderness area with no cell service. So I figured why not create an offline map with trails and topo maps using Collector offline mode? The map downloaded to my device just fine and works great. However, when I put my phone in airplane mode (which is what it will be in on my trip to save battery life searching for a cell signal), the Collector app gives me a blank screen and wont show me any maps. It gives a pop up that says a cell or wifi signal is required.
Is this a bug, or by design? If by design, it would seem to defeat the purpose of an "offline" map, if you have to open it "online" first.