Thank you for your post and feedback. When pushing defects to JIRA, the referenced test will show the associated attachments when using the TestRail for JIRA Test Management add-on.
As you can see in the above screenshot, any attachments that were attached to the test, show up when viewing the JIRA defect. This allows you to view any screenshots that may be associated with the test. If there are specific attachments outside of screenshots, these can easily be viewed by clicking on the referenced test ID.