Solved! Go to Solution.
How do you do this on an ipad? When I connect it to my computer, which is Windows, I can't drill into any folders of the device.
You can check "Use basemaps on your device" at Go offline—Collector for ArcGIS | ArcGIS.
iTune in Windows should support this:
iTunes 11 for Windows: Transfer files between your computer and mobile apps
Did you put it into the Collector basemap folder or into the ArcGIS_Collector folder? You will also have to restart the app and when you go to download a new map you will have the option to Choose an existing basemap or you can download a new basemap which will be coming from the web maps basemap.