Link previews to direct images (png and jpg) don’t work for me in signal. I didn’t try mp4 or mov files yet.
Links to websites will show something though.
Discussion
It must be a signal / encryption thing? Can you confirm you can access the link every other way? Post it in a browser and it works?
Oh wait, just the link ‘previews’? The links work?
If just previews that is how signal handles the links..
That’s what I’m thinking.
I’m just providing a 3rd party perspective and barely use signal, much less for linking image URLs.
I tested the same thing with non nostr.build image files so I’m pretty sure you’re right on it being a signal thing and not being your service (which just literally serves up the https requests and provides the images.)