Senders email with publickey normal?

Hello all.
I followed a video (link provided below), and did a dry run to see how it played out. I found it interesting that unlike the video, the Gmail inbox at the last part of the video showed no publickey. I see the two publickey - XXXXXXXX@proton.me - XXXXXXXXXX.asc files attach with my email address as part of the naming in the attached files. Is this normal?