Thanks so much for the reply.
By Checking the pdf extension do you mean:
Components > Flexicontent > Global Configuration
In the global configuration popout, there is the Files Configuration Section.
In the Legal Extensions (File Types) field I have:
bmp,csv,doc,gif,ico,jpg,jpeg,odg,odp,ods,odt,pdf,png,ppt,swf,txt,xcf,xls,zip, BMP,CSV,DOC,GIF,ICO,JPG,JPEG,ODG,ODP,ODS,ODT,PDF,PNG,PPT,SWF,TXT,XCF,XLS,ZIP
Is this what you were referring to?