Issue links in Jira are a helpful tool to keep track of changes throughout different issues.
In the following use case attachments that were added to the current issue will also be copied to all cloning issues.
Add the Update linked issue or sub-task post function to the desired transition or create a new transition.
Click on Add field.
Choose Attachments (only new attachments will be added)
Choose Copy field value form current issue
Choose Attachments
Update the following filters according to your needs.
Choose is cloned by
Choose To Do, Open, In Progress
Update linked issue or sub-task