Yes you can, up to the submission deadline. In order to create the best application and avoid the need for later edits, we recommend that you write your answers to the application in a Word document. Then you can save the Word document on your computer, and return to it every day or two, to review and update your answers. When you are finally satisfied with your answers, then it is time to submit your application. If you have materials that are too large or numerous to include, such as many attachments or a large video, you can put links to these items inside your application. Please do not email us videos or large documents. Instead, create a link to a folder in Dropbox or Google Drive. Make sure the sharing permissions are not limited so that we can access your folder for many weeks or months after you submit your application.