I also have a button outside the gallery named btnSave.
Here are my requirements:
The user will search for and select a user through the cmbAssignTo People Picker. This is working;
The app should update the AssignedTo field in the collection with the user selected in previous step. I’m using OnChange action for that, but I could not make it work. I’m having all kinds of errors (different schema, data type compatibility issues, etc.);
I want the People Picker (cmbAssignTo) to display the user (if any) stored on the colCheckListItems I tried setting its Default property to ThisItem.AssignedTo but it did not work;
When user clicks the btnSave button, I want the app to save the data on the colCheckListItems collection back to CheckListItem