moto g5 plus attaching photo to text msg?

I am just now learning how to use my G5 Plus and when I attach a photo to a text message I am sending, the person I send it to doesn't receive the photo with my phone number attached but instead it goes through with a designation of 233-xx instead. How can I attach a photo to my text that will go through designated as coming from me / my cell phone number instead of some weird set of numbers? Thanks.

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