To import all channels of an OpenEXR file, do the following:

1. From the File menu, click Import.
2. When the File Browser opens, select an OpenEXR file.
3. Right-click on the file and select “Import All Channels” from the context menu.

   

Once you have selected “all channels,” a new node will appear in the Schematic, which displays tabs that each correspond to an output connection. In other words, all channels are imported into different import nodes which creates a group with multiple output connections that corresponds to each import node’s output. The following image displays a UI with two schematics. The Schematic on the left displays the group node, the Schematic on the right displays the import nodes with their output connections.