I went ahead and took a look at your account, and sent a test email to myself of your most recent campaign. I was able to send a test to a few different email clients, and your logo image showed up in all of them.
Some email clients might not display any images at first, which requires you to click a prompt to download the images. I would suggest looking for that 'download images' type button, or sending a test to more varied email clients to see if you can see that logo in others.
Aaron H Community & Social Media Support
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