Would you please share more details about the SharePoint column type?
Currenlty for fields that allows multiple values are not be supported under PowerApps.
For the other single value field, the update should work.
Check the following article for more known issues when working with SharePoint list under PowerApps:
Fill out a quick form to claim your user group badge now!
Find out where you can attend!
Features releasing from October 2019 through March 2020
Learn how to build the business apps that you need.