Do I need to keep my paper receipts once uploaded to QB?

I can share some information about receipts in QuickBooks Self-Employed (QBSE), @myrtletreebakery.

These receipts are proof of your business expenses. In QBSE, you can attach digital copies of receipts to transactions. This lets you keep everything in one place.

Try checking with the HMRC or your tax professional if digital receipts are acceptable forms of documentation. Just make sure that the receipt is accurate, complete and readable. Otherwise, HMRC will charge you a penalty if your records are not.

In case you're audited or asked to show documentation, you can always go to your Transactions page to download the receipt that you've added to your QBSE account. 

Check this article for more information: Record or attach expense receipts in QuickBooks Self-Employed. 

Also, see this reference for detailed guidance on how to manually add transactions in QuickBooks Self-Employed.

Let me know if you still have questions about adding a receipt in QBSE and or anything else. I'm always here to help. Have a wonderful day!