How to upload an attachment to an existing Trello card?

I am trying to do the same. I have an existing card in Trello, I have created a form in Jotform and successfully filled out teh form, hit SUBMIT. I get the email notification with the PDF embeded in the email. HOW to I get that same PDF or another submission file IN to the Trello Card that is pre existing. I do not want to make new CARDS

If you want to upload a file to an existing card in Trello, you can use a third party tool like Zapier for that.

1. Create a zap and set JotForm as the Trigger app
2. Select Trello as the Action app and set Add Attachment to Card as the Action

Set the template settings:

The result (attachment is added to the Trello card):

Let us know if you need further help.

I'm not sure I'm understanding the purpose of this action.  Naming a specific card makes all attachments go to that single card then?

If cards are already set up in trello for each jotform submission using a zap to accomplish, how or why does this zap work?  (I'm not even sure about my questions as I'm a confused by the purpose.)

Thanks.

@johannasophia

I found you have your own post about this already here https://www.jotform.com/answers/1396418

We will resolve your concern on that thread.