Why do my maps not appear on Collector app?

[KristenRyan]

I have created a few maps online, saved and shared to a group... but I cannot view them from the Collector app. Why would this be?

[MarkBockenhauer · Accepted solution]

It could be that there is not an editable layer in the map?   Collector can only use maps that have editable layers, try enabling editing for a feature layer in your map that you want to edit with Collector.