Hey @Sam_400º, thanks so much for flagging this to us!
I just had a quick look on my own account to check for historical data of invoices and, you're right. There currently isn't a way to any revision history on invoices. I can definitely see why this would be beneficial to keep for your records. I'll make sure to let our product team know of your feedback. Hopefully, this will be something we'll be able to facilitate in the future.
If there is anything else I can do for you, let me know! I'd be happy to help. 😊
