Though not guaranteed to be 100% accurate, this AI answer may help...
"Changing or Deleting the Original Photo in NCH PhotoStage
Replace the Original Photo:
- In PhotoStage, you can replace an existing image in your project by locating it in the Media List, right-clicking on it, and selecting "Edit in external editor." This allows you to modify the image, but it does not directly swap the image for a new one within PhotoStage itself.
To fully replace the photo, you would typically remove the original image from the slide and add a new image in its place.
Delete the Original Photo and Use a Background:
To delete the original photo from a slide, right-click on the image in the Media List or on the slide timeline and select "Remove item(s)"
. This will leave the slide empty or remove the slide entirely if it only contained that image.
If you want to use a background instead of a photo, PhotoStage allows you to add background themes or custom background images. You can do this by:
Opening the Background Theme dialog (via the Theme drop-down or the Select… button in the Quick Create Dialog).
In the Background Theme dialog, you can select built-in themes or add your own custom background images.
You can manage (add or delete) up to 20 custom background images for use as backgrounds in your slides.
Adding Overlays to a Background:
Once you have a blank slide or a slide with a background image, you can add overlays (such as text or additional images) using the overlay or effects options within PhotoStage.

If you want a slide with only a background and overlays, simply remove the original photo, set your desired background, and add overlays as needed. This workflow allows you to fully customize each slide's appearance in PhotoStage."