I made and published app to use with Collector for our animal control officer. He needs to capture a signature upon completing his entry, How can you collect signature using ArcGIS Collector App
I know this is possible using the Survey123 app. See the below link for a comparison of the different mobile apps.
Skipping questions, applying expressions to pre-calculate and validate responses, presenting the form in different languages, capturing signatures and much more are some of these unique smart form features in Survey123.