By using a blog, you can insert a Gallery of up to 250 slideshow images. You could just create one blog post, and then embed the slideshow of all photos in it. See here: https://support.squarespace.com/hc/en-us/articles/206543407-Gallery-blocks#toc-where-to-add-gallery-blocks
here is how to add audio: https://support.squarespace.com/hc/en-us/articles/206543197?_ga=2.121418824.1956359460.1631372410-483007693.1631192848
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