By looking at inline-uploading.php, it seems to me that when the width of an image is more than 128 pixels, WP will call the function wp_create_thumbnail to create a thumbnail for the image. For some reason, sometimes, this is not working for me. I have an jpg image that is 800×600. WP does not seem to be able to determine the size of this file so no thumbnail is created. If i convert the same file to the png format, then WP will create thumbnail. What’s going on?
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