Thanks a lot for your sharing, I believe others who have the similar issue will benefit for your post.
1: Update the sharepoint list from powerapps
2: Add a flow with trigger set to powerapps (you should call this flow in your app code directly after updating the sharepoint list)
3:In your flow:
You will probably need to add a condition 1st within the apply to each if you are adding AND updating so it knows whether to add the row or update.
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