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I'd assume that the preview image was cached, but the high res version wasn't. And now the image can't be loaded but the preview still appears because it's cached or something
Well, how to cache the high res version then ?
Probably by opening it once, no idea how the app caches images. But it was more of a wild guess for a potential reason why it's not working rather than a suggestion about what to do. Does it happen with every image or just that one? If it happens with every image then i guess it's a problem with the app (or your internet connection), if it's just this one then the image is probably not available anymore and it's just showing the preview because it cached it before. In that case there's probably nothing you can do.
After some testing, it seems that the issue only occurs with that image.
However, when using my browser instead of the app, I have no trouble opening the high res image.
The picture it shows on the post normally is a preview from your instance. Whem you tap on the image, it tries to load the original picture. It is possible that it may have been removed. There is also an open issue about images on catbox.moe:
Hey! Just wanna let you know that I submitted a PR fixing that catbox.moe issue, if you wanna check it out...
(also working on adding preview for RedGIFs)
Thank you for your contribution!
As I was saying, it loads fine in browser, so it can't have been removed :
