As a Jira user, In the display screen of an issue, at the middle right, click on the icons to order files from top to down or positioning between the files

When you click on the icon  : the file will be positioned at the top of the list

When you click on the icon  : the file will be positioned at the bottom of the list

When you click on the icon  : the file will go up from a place

When you click on the icon  : the file will go down from a place