Hi, I have a template file (it can be either a .pdf or a .docx) which I'd like to populate with data - from a json file. - and retrieve a pdf out of it. But I also need that pdf to have form fields: dropdowns that the user can select options from, and also a signature field. I can see from the API endpoints options to update and convert a docx into pdf. But when doing so, the forms are lost from the file. So the question is: how to maintain those dropdowns and signature fields on the final pdf file?