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Hi Jeremy,
By default the latest updated data will be taken into account. For example: I updated complete product with full insert and sent supplemental feed after that for price update, then price updated by supplemental feed will be taken into account.
The supplemental feed is used to update the existing product. If you are sending a supplemental feed for a non existing product you might end up seeing errors like offer does not exist for that product. Please note that always latest insert or update is taken into account. So, if you reinsert the product then the data that is uploaded while inserting will be taken into account.
https://developers.google.com/shopping-content/guides/products/supplemental-feeds/using-supplemental-feeds