Where do I upload documents such as divorce decree or social security card?

[xmasbaby0]

You do not include your SS card or your divorce decree on a tax return.  And....the software has not asked for those.   In MY INFO, you will enter your personal information which will include your Social Security number.  You will be asked if you were married in 2025, and you can say NO if your divorce was final by the end of 2025.   You will then file as Single, unless you have custody of a dependent, and then you might be able to file as Head of Household.   You will not be required to upload your SS card or divorce papers.

[LaShaunA3]

As Xmasbaby0 stated, you don't upload documents like a divorce decree or Social Security card when e-filing your tax return. You only provide those documents if the IRS specifically requests them later.