They continue to show up on my ping page, so they haven’t been blocked by the hosting site.
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That’s the problem - the FR page loads before the host site replies, so no images show.
Best to do a search for a .jpg of the image you want to post. Takes a bit longer with multiple images, but they will show.
Some host sites have very fast servers so it is not a problem, however, there is no way to tell offhand. Using host sites for images is a common mistake on FR.
Is there another way? I'd love to know -- can you explain?
If that is the only problem, it usually can be fixed by a refresh; or the pix will show up later on the person's ping page. But sometimes people experience incompatability with their ISP or other parts of the internet. Some providers suppress FR, for instance. Some people's own computers have stringent preference settings or size limits to downloads.