Upload & Sell: On
The only time to get really worried about an email from PayPal, eBay, or the like is when they attach a link for you to login with. Using that link would be a bad thing to do!
P.S. this wasn't prompted by the OP question, it's simply 'an advisory' for those not in the know.
There is a link in the e-mail, and PayPal already has a number of my credit cards on file. They don't need more.