The instrument must include a notice on the first page that it is being recorded electronically per N.C.G.S. 47-14(a1)(5):

Submitted electronically by ______ (submitter's name) in compliance with North Carolina statutes governing recordable documents and the terms of the submitter agreement with the ______ (insert county name) County Register of Deeds.

Now you can choose to append this to the first page of your instrument when you upload your PDF! Just click the checkbox for Add eRecording Disclaimer to Document when you're adding an instrument!