cant import photos or videos

I'm trying to get me photos off my phone and onto my computer to give me some space on my phone but my laptop wont let me. A while ago (when I first connected my phone to my laptop) the usual notification popped up asking what I wanted to do with it but at the time I didn't need to import anything so I clicked out of it. Since then the notification hasn't come back whenever I connect my phone to my laptop and it wont let me import anything.