The only types of documents that can be uploaded are .doc and .docx.  I researched the exclusion of uploading PDFs, and found that you have labeled a PDF as a security issue.  Following SOP, I stripped off everything in the properties and then printed it via MS PDF.  I also created a .doc then printed it to MS PDF.  I further used Paperport to strip off any "security" triggers.  I still could not upload any of those cleaned PDFs into templates of any category.  Many things in PDF cannot simply be converted into a .doc or .docx.  Some convert nicely using Powerpoint in Office 365, but that doesn't work either.  Please consider allowing PDFs, or provide a workaround, or allow PPT files?  Thanks!