Upload Files from JotForm to Pipedrive

We use JotForm to transfer documents to Pipedrive (PDF, Doc and Jpeg mostly). Applicants are prompted to upload 6 different files (these are required to even complete the form). Sometimes all six files appear in pipedrive, sometimes only one or two. I cannot discern a pattern as to when they appear and when they don't. (All six files are available in the JotForm inbox. They are often simply not transferred to Pipedrive.)

Does Pipedrive only accept certain file formats?

Is there a size limit?