myUpload is a feature from myE-Verify that allows you to electronically upload images of your documentation to help resolve your E-Verify or Self Check DHS Tentative Nonconfirmation (Mismatch). 

A DHS Tentative Nonconfirmation (Mismatch) case result means that the information your employer entered in E-Verify from your Form I-9, Employment Eligibility Verification, did not match records available to DHS.

A DHS or SSA Tentative Nonconfirmation (mismatch) results when the information entered in E-Verify does not match DHS records or data available to SSA. A mismatch does not necessarily mean that the employee is not authorized to work in the United States.

E-Verify may issue a U.S. Department of Homeland Security (DHS) and/or Social Security Administration (SSA) Tentative Nonconfirmation (Mismatch) case result for a variety of reasons. For a list of possible reasons why your case received a mismatch case result, see Why did my E-Verify case receive a mismatch case result?

Your employer may inform you that your E-Verify case received a U.S. Department of Homeland Security (DHS) and/or Social Security Administration (SSA) Tentative Nonconfirmation (mismatch) case result.