How do I resize a photo file size to 10mb?

3.5mb is probably the size of the image compressed for storage on the computer. Open it in photoshop and at the bottom left of the window for the image it should show something like, for example 3.5/8

3.5 is the size of the image compressed and the size after the / is the actual true size when opened in a photo editing programme. That's the figure that will need to be 10mb, which should make it pretty easy to get to your required size. Is this for Alamy by any chance? I was confused by this myself at first with them.

P.S. You may also need to scale the image up to help, so it will need to be a nice and sharp to start with.
 
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