The built-in image editor works every time you need to embed an image in a panorama.
It copies the image to the tour. If necessary, change the file format. It changes the size if necessary, optimizes.
It creates icons for use in galleries and infoboxes.
It allows you to take screenshots and prepare new thumbs for navigation.
Some of its functions are performed automatically. The part allows you to change the settings, for example, creating icons.
In addition, there is a simple tool that is placed separately in the add functions tab. It allows you to optimize images, resize them, and optionally create a border around the image. In most cases, its functions are duplicated by other editors. But if you are going to use an image often, for example, to create your own icon hotspots, you may need it.