While working on my tablet with Collector I tried updating a feature. When I hit the check mark to save my edits, I receive the error message "unable to update feature." I've tried it in the field, and at the office connected to wifi. The online map details show me it has full editing capabilities enabled, as well as offline use.
You might want to pose your question on a Collector community in GeoNet. This space is for questions about the My Esri website.
Thank you, I will give that a try.