If I rename a picture in files would it unlink it from the email it's already embed into?

I have so much junk in the gallery when I build an email and need to find a way to clean it up, delete the old stuff and change the name of the items but I can’t find the gallery anywhere. How can I do that? Is there even one to begin with?

If you go to the ‘house’ icon in the top navigation and then go under ‘files’ — you should see ‘company images’. You should be able to delete items from there.