Using FMGo 15 on the iPad, when a user inserts a .pdf file into a secure storage container field, it then cannot be opened from the iPad. The file does open from the computer. Here is the Get As Text for the container field. It seems to have an extra space before the : on the PDF file line:
remote:How to write an Order in FP.pdf
Other document types can be imported and viewed, but not the .pdf.