I have another question.

[Phongpon]

It's involved custom/edited section yet again, and i don't want to bump the old post.
So if i uploaded the sheet, can i updated it later on? (and yes, i haven't even submit once yet).

[Petie]

You can submit a revision to it which would need to be approved by staff, just like any other submission on the site. The only difference with customs is that only the original submitter can revise them.