About Ajofo500 - open to bidding

Hi there, sorry to bother you with this! I see we have both been accepted by the user Ajofo500 to complete a project. I have just requested a milestone from him to ensure payment of the project and he has refused to do so, which makes me wonder if he is scamming us. I just spoke to a member of the Freelancer team and they strongly advised me not to send any files without the setting up of a milestone. What are your thoughts on this? I am a little worried to spend 2 days writing a paper and then get scammed! Cheers, Darren