Yes! You can upload your content (ePub, Mobi, or PDF) and cover (jpg or png) files when you are creating a title. You will be prompted to browse your computer to find the files to upload.
Next you will click "Choose Files" to browse your computer for the files to upload. Please note that cover images must be 8MB or less.
If you would like to replace a file at any time, navigate to your title details page and look for "Settings" in the side-bar to the left of your title details, and click "Upload Files".