It's good to have you here in the QuickBooks Community, @TrixieT.

When you sync your PayPal transactions with QuickBooks Online, we have to make sure that all of your PayPal sales are recorded. This is to verify that the system correctly matches your transactions and does not duplicate your income. We also need to double-check that the products/services used in QBO matches your PayPal transactions.

To match them with sales receipts:

1. Go to the Banking menu.
2. From the Bank and Credit Cards drop-down menu, select your bank account.
3. In the For Review tab, find and click your PayPal payment transaction, then select Categorize or Find Match.
4. Choose the sales receipt.
5. Click Save.

I'll share an article about categorizing or finding a match of your downloaded banking transactions.

If you have any clarifications about the process or other concerns, post a comment on this thread. I’ll be glad to help and make sure this is taken care of for you.