Hi @sf1173nyc ,
I was so happy to find this post! I have been trying to figure out this checkbox issue for months! I followed Reza's video, and one by Krishna Rachakonda, and other various videos and posts. The problem with all of them was they were using the canvas app and not the integrated app. And also - MS seems to change things so often, pieces of code and screenshots all seem to be irrelevant 6 months later. 😞
Unfortunately, following your guide I have still not been able to make this work!
I did all the stuff in Reza's video. Then I made OnVisible blank (nothing in it) and updated the Checkbox Default and the OnEdit, On New and OnView for the SharePointIntegration. And the datacard's Default is set to the collection.
Those three in the SharePointIntegration aren't working for me. They all have the squiggly red underline under Refresh(Checkbox1).

There are two errors for each of these:
- Expected a record or table value
- The function 'Refresh' has some invalid arguments.
I tried changing it from Checkbox to the gallery, the datacard, the form, everything! Obviously I'm grasping at straws here. I don't understand why it doesn't like "checkbox1" when it works fine for you.