Jumping in to answer your question about this new feature, MickeyK.
The Receipt Management feature can only be used for purchase receipts and actual expense transactions. This is the reason why you're unable to match the captured receipt to the vendor's invoice. You need to make a bill payment first, then match it to the receipt that you uploaded in QuickBooks.
Let me share this article with you for more details: Upload Receipts To QuickBooks Desktop Pro Plus, Premier Plus Or Enterprise.
I'd also recommend checking out this article for more details about the new features that are available in the latest version of QuickBooks: What’s New In QuickBooks Desktop 2021.
Please don't hesitate to reach out to us again if you need more help with QuickBooks.
