Dear Tumblr,
This new photo uploader is terrible. The one thing it does right is adding drag-and-drop; aside from that, there is no excuse for:
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Blocking the browser trying to generate an “instant preview” data URI, especially for large images.
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Showing no indication that an image is currently uploading, which makes it nearly impossible to figure out if a post succeeded.
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Long waits if you click “Create post” while a photo is still being processed, with only a spinner in the bottom-right corner.
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Absolutely useless error messages, which are admittedly a carryover from the previous photo posting page.
At least you fixed Markdown previews.
~if