Is there a way to utilize Google basemap imagery in a map and use them in offline files in Field Maps? I have added the imagery as a basemap in the map but it says the layer is not supported for offline use. Anyone?
Offline maps need an ArcGIS tile service that has tile export enabled. If neither Google nor ArcGIS Online offer that service you'll have to grab tiles form Google's services and stitch them together to make your own tile cache -- assuming that doesn't violate any terms of service agreements. If all you need is satellite imagery in general then take a look at this collection of basemaps to see if anything fits your map.