I applied for a Schengen visa 2 months ago for my trip to Greece earlier this month. I was expecting to get a multiple-entry Schengen visa for 3 months, but they only gave a visa for 9 days for the duration of my trip to Greece.
I am now planning to go on a day trip to Paris in August and a trip to Portugal in October. How do I go about applying for the Schengen visa to ensure I get a multiple-entry visa?
Also, since I am not actually staying in Paris, what kind of documents I'd provide as the proof of accommodation?