disable the GPS. If the activity you upload has position data in it, you will get a map. At least for me, when my GPS is disabled, I didn't get a map in Garmin Connect. However it's probably been two years since I've uploaded an activity with no GPS data. So I don't really know how the modern GC handles it.
If the activity you upload has position data in it, you will get a map.
I figured that my GPS must be enabled, or I wouldn't be getting distance information.