In this series of 3 episodes, Daniel Christian shows everything about PowerApps Permission. It is about ‘Give Access’ & ‘Remove User Access’ & ‘Temporary Access’. This will give you a great overview, and you will learn how to best handle all of these access.
This series of videos is just fantastic. It helps to understand the delegation of PowerApps to SharePoint and Reza Dorrani gives good workarounds for different scenarios and data types. Here you will find an overview of ‘Power Apps delegable functions and operations for SharePoint‘.