Hello @ISI ,
Depending on the email program they're using to view emails, it's possible their system is just blocking the images until explicitly told to download/show them. Have them check the email to see if there are any prompts to show the images, or check their settings to allow images to display. If the images are displaying with blank areas and small X or torn page icons, have your client right-click on that area to see if download or show images are available as an option.
These articles may provide some additional clarity or guidance for your client as well:
Missing Images in an Email Campaign
Images Not Displaying in Various Email Clients
... View more
