Pointer to Gallery Images

Using WordPress 5.3.6. I cannot find the images in my gallery. I would like to change them. This gallery was added maybe a decade ago. Nothing is in the folder below.

wp-content/uploads/slideshow-gallery

Perhaps there is a file that points to the images in the media library. If so, I could change the pointers to different images. Is there such a file?

The reply https://wordpress.org/support/topic/location-of-images-2/ indicates there should be a photo-gallery folder, not a slideshow-gallery folder. Should I start a new gallery, and if so, how would I make sure the new gallery would replace the old one?

Thanks for your help with this.

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