When there is a file included in an outbound webhook, it needs to be formatted in a way that other systems could download it.
Right now if you select the file data type to be put into a webhook, it presents as a sting value showing the file path from within Caspio. Instead, we would like to see it be a link that can we acted upon by other 3rd party systems so they could download the file.

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Piotr commented
Thank you for your suggestion. We implemented this feature for attachment data type, which is used in Flex applications. As a user who is setting up custom payload in webhook definition you may choose what you want to add to your payload: File name or File URL.
https://howto.caspio.com/integrate-your-apps/webhooks/webhooks-in-caspio/