HICR-001 Attach a binary file

I get the following error code: HICR-001 - If Line Income Tax paid to other state or country [IncTaxPaidToOtherStateOrCntry] is greater than zero on the Schedule CR, then binary attachment(s) with the file name beginning with 'TaxPaidAnotherState' must be present.

 

How do I attach this binary file?  I added the documents to my "Documents" section in TurboTax Online, but I am not confident they were transmitted.  I saw some other posts that mentioned that attaching files is not possible (but the error message seems to indicate otherwise).  Is there something else I should be doing or am I good?