How is Echosign determining that the word signature or sign is in a document? Is there a Flash component? My content management system is refusing my upload because it is looking for a flash file. I have converted InDesign files to a pdfs hundreds of times without issue, until now. This is the only thing different. And i do have the word signature in the file because it's a cover letter example. So, please let me know if this detector is the flash file my CMS is looking for.