Thank you for your interest in this issue.
After reviewing this suggestion we believe that it was resolved in JSD 4.8 with the introduction of duplicate attachment detection:
When customers raise requests over email, the email body is added to the request’s description. This often includes some unwanted media like marketing images, company logos, and everything else from the email’s footer. With every new comment or update, these images get duplicated, making it difficult to find anything important. We’ve heard your feedback and changed it—Jira Service Desk will now detect and ignore any duplicates, leaving your requests nice and clean.
Please provide further details if there are additional use cases you would like us to consider in relation to image attachments.
Jira Service Management, Server & Data Center