Currently, if I wish to upscale all the photos in a batch, I set the parameters with the first file, go to the options and apply current settings to all the photos, which sets all photos to be upsized, and then once more apply the autopilot to all photos. If there’s a way to achieve this that’s better, I’d love to figure that out. If not, I’d like to suggest this.
If you open the app preferences dialog, there is a section for auto upscaling. You can set the output size based on dimensions or how much scaling to apply (e.g 2x, 4x, etc.). This will apply to all open files you haven’t manually changed settings on, and will persist between sessions.