Hello @ycying,
Welcome to the PayPal Community! I'm sorry to hear your account has been locked. If you've already submitted the requested information but the limitation or lock has not been lifted, our review teams may still be asking for more info. Normally you'll receive an update via email if they need more information. For further assistance on limitations and uploading docs, I recommend reaching out to our Customer Support by clicking Contact at the bottom of the PayPal website. They're also available through Twitter direct message or Facebook instant message.
Good luck!
- Jon K
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