Please refer to Case Number: 00141929 where my explanation describes a scenario that should be addressed in an update to the Netacad application/platform. Briefly, I was attempting to upload a Power Point file and it appeared to be a successful upload but when the Activity was selected the uploaded file was not included. And there was no indication why. No warning. No error. I worked on this for 3-4 hours over two days before submitting a case and also contacting the support desk. If this description or the text in the case is not clear, I will be glad to discuss real-time with someone.