You can find documents/images in the menu Settings -> Documents/Images. Here is the screen that is displayed when selecting the menu item.
To transfer e.g. a picture press "Upload New" and select the picture to be transferred.
File name for the transferred image/document, You can change this name if you wish to.
Here you can select a language and then provide language dependent information that the user will see in e.g. the webshop.
Here you may provide a title that is shown with the picture when e.g. showing product details in the webshop.