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If you create a slideshow project and save it, you can reopen the project later for further editing. This is done simply by double-clicking on the slideshow project icon. However, if you have created a slideshow and exported it out to a video file or PDF, you will not be able to edit that with Photoshop Elements.
A freshly created slide show will be the first item listed in your Organizer if you are in Thumbnail View.
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