You can upload a photo or document to an individual's profile on your family tree by first clicking on their name to open the sidebar, then clicking ‘view full profile’.
From here, you click on the 'media' link and then 'add media'.
Finally, you choose which file/photo you would like to upload from your computer and it will take a few seconds to upload.
You then have the option to add further information about the photo or document. For photos, you can decide if you want it to be the main profile photo for that person in your family tree.