Correct, you can't attach any documents when you Efile.
Your W-2 and other documents are entered into the program. What are you referring to as your 'social security W-2'? Do you mean Form SSA-1099 that reports your Social Security payments?
If so, that is not entered in the W-2 section. Here's How to Enter Social Security Benefits (SSA-1099).
If not, please clarify and we'll try to help.
@Sighman
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