Issue Summary

Currently, when utilizing the feature to customize email content, following the documentation Customizing email content Customizing email content and applying the solution shared on Examples: Customizing email content, depends on the method utilized in the template to reference the image, it will fail with the error in the image section: "The Linked image cannot be displayed. The file may have been moved, renamed or deleted"

Checking the Catalina.out you may the following error:

2024-04-17 12:07:32,338 https-jsse-nio-8443-exec-19 WARN   -   [web.action.util.Error404] Detected anonymous access to page <https://<base URL/<path to image>/<image name.png> redirecting to login page

Steps to Reproduce

1. Configure Jira to send notification per this document
2. Go to Administration   > System. 
3. Under Mail, * select Email templates{*}.
4. Download .zip: Download a ZIP archive with all available templates and edit them locally.
5. Extract the content, create 
6. Add the image file to the ZIP archive you downloaded from Jira. You should create a new folder for it at the top of the hierarchy, next to email and email-batch.
7. Compress the folders with the new image folder and reference (linked) the images following the documentation.
8. Upload the templates.zip again, make sure to see the information that the uploading has been performed with no errors, and wait 5 minutes to test.

Expected Results

After successfully uploading the templates.zip and triggering an email notification with the customized logo, the image is load from the linked source and displayed in the email header, foot or body.

Actual Results

The images in the notification email don't render and an error message is displayed:

"The Linked image cannot be displayed. The file may have been moved, renamed or deleted"

Workaround

To remediate the issue, please follow the instructions below, it is similar to the document How to use custom images in Jira and share them in a cluster, please follow the steps:

1. Find the images imported by the templates.zip under $jira-home/templates/images
2. Copy the images from $jira-home/templates/images to $jira-install/atlassian-jira/images/mail/
3. Fix the permissions to match the same as the other images.
4. Open the email that does not work and check if the image is now showing.