upload failed usually has to do when something was implemented incorrectly, usually because there is typo somwhere, maybe a skin you worked on was titled incorrectly, like a skin in the skins folder being titled MMove.png or something, or maybe a type in a .xml of something, you'd have to look through all of the edited code you did and skim through it and make sure you don't have something like <Script>EditedPage</Scriptt>, not specifically this of course, but having an extra t in the second script inside the .xml is enough to make it a failed upload.

It could be a lot of things, but as long as you think you did everything right, the problem is usually a typo. I'd check all of that first. If not, then its it could be something was labeled incorrectly. always best to check everything you recently changed, if it used to work by doing test uploads.

引用自 Don't Stare：

upload failed usually has to do when something was implemented incorrectly, usually because there is typo somwhere, maybe a skin you worked on was titled incorrectly, like a skin in the skins folder being titled MMove.png or something, or maybe a type in a .xml of something, you'd have to look through all of the edited code you did and skim through it and make sure you don't have something like <Script>EditedPage</Scriptt>, not specifically this of course, but having an extra t in the second script inside the .xml is enough to make it a failed upload.

It could be a lot of things, but as long as you think you did everything right, the problem is usually a typo. I'd check all of that first. If not, then its it could be something was labeled incorrectly. always best to check everything you recently changed, if it used to work by doing test uploads.

I guessed that this could be, but still had no idea where I was wrong.
But even so, I created a backup copy, from where I deleted all the skins and changes in the page codes. But, unfortunately, it didn't help either. I'll try to start all over again.