The actual 1099-NEC form does not get uploaded to the IRS, instead the software recreates a version of the 1099-NEC using the information you entered in the system. The IRS will eventually receive a copy of the 1099-NEC from the issuer.
The only way that you can send in a physical copy of the 1099-NEC is by filling your return by mail (not electronically) along with any forms.