As explained in the launch posts, 3.0 has a new gallery which default themes use, and other themes can *choose* to use. Themes need to declare support for this gallery using the following:
You can read more about the gallery here https://woocommerce.wordpress.com/2017/04/04/say-hello-to-woocommerce-3-0-bionic-butterfly/
If you have missing gallery functionality, see if there is a theme update – the author may have already added support for the above.
If you notice missing placeholder images, this is a known issue and will be fixed in 3.0.1.
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