You may be asked to add uploads when completing a task:
Hint! If you upload images files (e.g. jpg, png) then this will allow you and other users to add annotations later on.
Choose the Uploads option:
Hint! If you're using a mobile device to upload then the Upload option will give you the option to Take a Photo or Choose from Camera roll.
Once files have completed uploading, you can preview them by clicking on the name of the file, or the thumbnail of the file (for JPG images).
Hint! Add further context to the images that you upload by adding annotations. Just click on an image to begin.
You can now Submit for review. For more information, please read the article: Completing a Task