The HTML form controls are not automatically translated into form controls when converted to PDF. The recommended approach is to recreate these form controls after conversion.
To accomplish this, we offer a Create PDF Forms API that you can utilize. To explore this API further and view code samples, please visit our API Docs at https://apidocs.pdf.co/06-pdf-create-fillable-pdf-forms.
To create Fillable PDF in Zapier, please check out this step-by-step guide https://pdf.co/create-fillable-form-using-pdf-co-and-zapier
And for Integromat/Make, please visit this tutorial https://pdf.co/create-fillable-forms-integromat