Show Attachments Dialog

Hi, I have a customer that is having a problem adding an attachment in a Service Desk project. I am trying to replicate this but there JIRA instance (7.4.2) behaves differently than mine (they provided a video) (also 7.4.2)

If they try to create a new comment and then click on the attachments icon a file chooser window appears. They select a file and click open then a “Add attachments” dialog automatically appears. My JIRA behaves differently, when the I select the file and click open it drops back to the comment entry area

How do I get the Add attachments dialog to appear on my system

Had to go back to an earlier version of JIRA to get this to appear. For earlier version it doesn’t appear for all file types (PDF makes it appear but gif doesn’t)