Although you may choose to edit the media elements only through the editing dialogs, when an input to a medium is a link from other elements in the model, you may prefer to create the link via the browser view and/or the input interface to the medium. In addition, experienced users may find it more convenient to create links from media elements using the browser or the output interface. This section discusses the browser view for each of the medium elements (recall that the input and output interfaces to an element are simply partial copies of the browser view).
Note: Element inputs and outputs are only shown in the browser if you choose to Show element subitems (accessed via the browser context menu by right-clicking in the browser).
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Reference Fluid Inputs and Outputs in the Browser