The format's not the problem. For whatever reason, my up-speed has taken a drastic turn for the worst, but my down-speed is pretty good. I was having issues uploading to my dir on Yoroshii too
Although it doesn't make much sense that the image preview wouldn't upload <_<;;
Also check this out- It attached it to this post, when I didn't try to upload it here...
Your attachment couldn't be saved. This might happen because it took too long to upload or the file is bigger than the server will allow.
Please consult your server administrator for more information.
Either somethings glitched, or my net's scrambling my uploads