National Gun Trusts did a fantastic job arranging for me to have my fingerprints scanned at the UPS Store. I received my EFT file via the link in the e-mail while I was still in the process of departing the UPS Store. I then (because I needed to register my AR pistol) I followed the National Gun Trusts YouTube E-Form 1 walkthrough pursuant to ATF Final Rule 2021R-08F. While filling out the application, I attached the EFT file provided to me. Upon completing the application, the ATF e-mailed me both a submitted copy of my application as well as a cover letter marked "REC'D". If your cover letter is marked REC'D then your EFT fingerprint file has been accepted and validated. And you do not have to send in the physical fingerprint cards, which was the whole point of this service. Also, if you submit your ATF E-Form 1 for your "stabilizing brace" AR pistol prior to the end of May 31, you are allowed to adopt the markings on the firearm and will NOT have to engrave the lower receiver.