first of all, no images are embedded in this feed - images there are linked to by their URIs. don’t use words if you don’t know what they mean, it’s just confusing.
second of all, it’s not about the URI itself (or the :orig suffix in it). there’s two images in every post:
i assume it’s a thumbnail which is in article content,
<img> tag, that one would show in tt-rss regardless of :orig being there or not, it doesn’t matter.
full image which is linked as an enclosure. in order for an enclosure to be shown inline as media content, it needs to either have a correct content type (i.e.
image/png) or lead to something looking like an image (this is actually a fallback method for badly configured feeds).
in your feed enclosures both have wrong content type (
application/octet-stream) and lead to a retarded URI which fails the check because of the suffix.
so, in short, that feed is bad and whoever produced it should feel bad. my advice would be telling people at “rss bridge” to fix their shit.
alternatively, since tt-rss is infinitely extensible, you can write a plugin which would embed this horrible misconfigured enclosure manually. good luck.
e: why did i waste so much time on this effortpost