What would be really powerful is if they included all the documents that were sent to them already without you having to upload them:

Here is your W2 as sent by your employer

Here is your 1099-INT as sent by your bank

Here is your 1099-B as sent by your brokerage form

Please upload other forms not sent to the IRS and any add in any other income and deductions.

This would really make me happy and save me many hours of time, and likely save millions if not billions of hours across the US.