Lets you select files to import into Postshot. You can also drag&drop the files on the the Postshot interface for the same effect. See Importing Images for more details.
Starts, pauses or continues the radiance field training.
Lets you create a new virtual camera. Cameras can be animated and contain the settings necessary to render new movies.
Starts rendering a movie using the selected or only camera. If the camera has no output filename set yet, you will be asked to select a output file and format first.

If an OpenXR device, such as a VR headset or stereo display, is available, checking this button will display the current scene on the active OpenXR device. You can then use XR head tracking alongside the regular navigation inputs to navigate the scene.