Asking for Elaboration
Could you elaborate (on that)?
Could you tell me a little more about it?
Could you give (me) some details?
Could you fill me in on that?
Could you expound on that?
What else can you tell us (about that)?
Is there anything else you can tell us?
Is there more to it?

To elaborate,
To give you more information,
Let me explain.
Let me elaborate.
Let me tell you a little more (about it).
Let me give you some details.
What's more,

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