Photos that myself and users have uploaded, if the extension is in caps for example photo.JPG, the thumbnail displays ok, but when you post, the post entry in the feed is blank and shows no image, change the file extension to lowercase photos.jpg and it works ok. I've added the mime types to the htaccess incase it was that but still doing the same.
Some phones seem to save the photos with extension in caps.
The same happens for .jpg .png from what I've tested so far
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votePhotos not working in feed if uploaded with file extension in caps