I am having issues on mobile devices when viewing html attachments.
To be more specific, I am having issues with the quick view feature on mobile phones where images are not showing up when someone goes to view the attachment.

Screen Shot with Images missing from html file

This is happening with multiple email clients on mobile phones only and not on desktop computers. I checked with other coders and it is not the html side but rather the device end.

Any insights why this is happening on multiple mobile devices and OS, but not on desktop clients, would be appreciated.