UM:Manual Render Controls
These controls are in the project library and let you set off specific render tasks, such as rendering a specific portion of the timeline, or rendering and exporting media.
Pressing the Render Output button will start (or queue) a render task for the currently active composition.
If you have marked an in-point, we will render from this position until we reach an out-point, or the end of the composition. If there is no in-point, we export the entire composition. If there is a Mark In and Mark Out set, we render any unrendered material lying between them.
For a discussion of the Export Media options, see the Exporting section.