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Showing up now once you hosted them on the other service.

No. I have seen this issue before with Google Photos. It apparently doesn't let you link to embed photos. It you actually go to the page for the photo, then go back to the post, the photo shows up, but that is because it is now cached in your browser.

You might try using a different place to host your photos like Flickr or PhotoBucket. Those seem to work fine.