I uploaded our logo in the default email template and updated the email logo header in global attributes to point to our logo. The preview on a new communication displays the logo, but it is missing on the actual sent email (. I tried reverting the email logo header in global attribute to the original file but that doesn't work anymore either.

This is what appears on the sent email

Then, trying as well as I could to follow the instructions in the Email Template Survival Guide, still have the same problem. Any ideas on how to fix it?