Good day, benmartinbcfc-ho.
There are two ways on how we can import invoices and receipts. We can link your Google account, or we can manually bring in the data into your QuickBooks Self-Employed account.
Here's how to link your business E-mail:
Just a heads-up, this feature is still in beta which is available to some random customer's account.
Also, if you want to manually import the data, from the Gear icon, select Imports. Then, locate the bank account and then click Imports older transactions.
Once done, you're good to categorise the transactions. Here's an article as a guide: Create Rules To Speed Up Reviews in QuickBooks Self-Employed.
There you have it, benmartinbcfc-ho. Let me know if there's anything that I can help with. Keep safe!