To assign subtitles to a node, click any node in the tree area to open either the Node Settings panel or the Parallel Node Settings panel. Which panel opens depends on the type of node that was selected. In the Node subtitles field, use the drop down to select an SRT file to assign to the node. SRT file assets uploaded in the Library will appear in the drop down. In lieu of using the drop down, it’s also possible to click to select an SRT file in the library, then drag and drop it into a node. This will need to be done for each node that you wish to assign subtitles to. Only English subtitles are supported at this time.
Additionally, in order for the subtitles to appear in the published version, click the wrench in the top right corner of the interface to navigate to Publish Settings. Under the Basic Info tab, select the This project has subtitles checkbox.