Ability to add PDF elevations and other PDFs in the questionnaire.

I have clients who need to upload PDF files of elevations, etc. I would like them to be able to do that during the questionnaire process. I can only find a question type that allows the upload of images, not PDFs. Please consider adding a question that allows my clients to upload PDFs. I am aware that there is an attachment area to upload PDFs, but it would be nice to add those PDFs while they are adding images to the questionnaire.