At some point Microsoft PowerApps Team added support for fields with multiple values through a Combo Box control. However, as of this moment (2/3/2019) there is still no native support for Checkbox controls even when you configure your Choice column in SharePoint to have Checkboxes (allow multiple selections). There is a good article (https://powerapps.microsoft.com/en-us/blog/multivaluedchoicesinforms/) published by Carlos Figueira … Continue reading PowerApps – using Checkbox controls with Multi-Valued Choice columns