I expect to have control over the content in my library. When I uploaded a file to an email and sent it I discovered that I no longer had control over the file that constant contact was hosting for me. Deleting the file from my library did not remove the file from constant contacts servers and users were still able to see the file that I had deleted from the system. A support representative was able to break the link to the file for me, but this is something that should be able to be done on the users side. I expect to have control over the files I upload.