I can't download any attachments from the list or library in SharePoint 2013.
Even I can't see the attachments. I only see the paperclips. What should I do?
You can use Event Receiver and create another list (ListA) to record your attachment link.
Maybe your process is:
Users add list items and attachments
List event will be fired
Use Event Receiver to get attachment url and then Write into ListA
You also can refer to the following web site:
You can use JSlink to make attachment download by clicking on Paper Clip Icon representing attachment. You can use the code and explaination provided in the below link.
It works wonder.