Upload it to a site like dropbox or mediafire you will wait AGES if you just upload it. Put it in the download link tab.

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upload the image to Imgur and put a link here, its easier than such a giant picture.

as for a solution, this sometimes happens to me as well but for projects (with or without download/schematic does not matter). It means PMC and your internet connection do not like each other at the moment. Save all the info you put in it, and reload the page. Then try again. Thats the only thing i've been able to work out. use speedtest.net to test your upload speed, if it is less than 1 mbs that might be the problem.

As for the blocking thing, thats also been happening to me a few times. I use a proxy-addon to change the Ip it sends to the website, and after a few tries it usually lets me back on. as soon as it does, my normal IP also works again for reason.

If it keeps up, try msging one of the site mods. If you cannot because the site keeps blocking you, use the PMC twitter.