can you merge two slide shows in photos
Is it possible to combine two slideshows into one
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If you export both slideshows as a video, you can combine both videos in a new slideshow. This will save the exact sequence of the photos and the titles you added.
Alternately, you can create a new, empty slideshow, then select with ⌘A and copy with ⌘C all slides from one of the two slideshows in the filmstrip, then paste them into the filmstrip of the new slideshow.
Repeat this for the photos from the second slideshow. Pasting will add the slides at the beginning of the filmstrip.