Trigger a Workflow Function if an Attachment (Related List) has been added

Trigger a Workflow Function if an Attachment (Related List) has been added

Hello, I have a Case Module with a related list which is Attachment. I want to trigger a workflow if I added an attachment. I've seen some topics about this in zoho community that was posted few months ago and based on the answers, there is no trigger for that.

Has this been updated/implemented? What can be the workaround to trigger my function for my Attachment? 
Thanks!