You can't attach additional documentation to your e-file. Just report the 1099-MISC information as it is on the form and make a balancing adjustment to report the correct amount of income.
For example, if your 1099-MISC shows $500 too much income, you can make a miscellaneous expenses entry of $500 and label it something like "Correction to 1099-MISC.".
If the amount of income is too low, just add additional income to make up the difference.
Keep your documentation for at least four years in case the IRS challenges the return. This is not likely.
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