I have a HubSpot form with contact fields and attachments. I would like to send those attachments to a different database.
I have an API key and documentation for the external database. I also have a forwarding email address that I could send the documents to as attachments (one at a time).
Files included as attachments to a form submission are stored in the file manager; you could pull the files from your file manager into your external database. Additionally, you could create a custom HTML form and submit the form to HubSpot using the forms API; this would allow you to do any pre-processing on your server (i.e. sending the file to your external database) before submitting to HubSpot.