Hi there, @hayleyrobynking.
You can keep either your paper or the uploaded copy. But specific recommendations would depend on your specific needs.
QuickBooks Self-Employed helps you with record-keeping, and receipts at the individual transaction:
This allows you to keep everything in one place, add notes, and retrieve receipts quickly. QuickBooks Self-Employed also makes smart suggestions for categorizing your expenses for your Schedule C.
If you have specific questions about receipts and record-keeping for tax purposes, we recommend you talk with your accountant or a tax professional.
For additional reference, I've attached some articles you can use to get receipts from your email, as well as how to create a new transaction directly from an image of your receipt:
Receipt Forwarding Feature
Let me know in the comment section below if you have any other questions. Have a great day ahead.