If you're frustrated with the Gadgets on Google Sites, you have to give https://www.powr.io/plugins a try! This site allows you to create gadgets to provide social media feeds, form entries, and galleries to your Google Sites page using the "Add Gadget by URL" feature in Sites.
I've used it here to create a feed of my Google Educators of Oklahoma Facebook page. Check out the last tab on the bottom row. I've also used it to create Social Media Icons at the top of the Home Page. Give it a shot and see how you like it! Here is an example of a Video Gallery.
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