But doesn't the instance it is delicious (edit: FUCK AUTOCORRECT!) delivered to do that, and then if the image changes later, it wouldn't update? And then I thought further that people from other instances likewise pull from the host instance, rather than the original source.
Except maybe Lemmy.world, if the image caching was added in a more recent update, which I thought was the case?
Anyway, I'm not saying that any of this happens, only that I thought it might.
Just hot link the image to a host that you have control of instead of uploading it to lemmy. Then you can change the image anytime you like and it won't be affected by any caching on lemmy.
That is what I have noticed. When I use Catbox, the exact Catbox URL appears on every instance. But when I upload directly to my instance, federated posts use their own cached image instead of the one from my instance.