Hi there, willards.
Currently, the ability to add two attachments to the bank entry in the For Review transactions is unavailable in QuickBooks Online. You can only allow this in the Bank register page.
Since this isn't currently an option, rest assured, I'll take note and submit this feature request. And, send it to the Product Development Team. They're constantly looking for great ideas from users, like yours, when deciding how to enhance QuickBooks.
I suggest visiting our QuickBooks Blog to know about the latest news and updates from QuickBooks Online.
Please know that you're always welcome to post if you have any other concerns. Wishing you and your business continued success.