Can I listen to a voice memo on my ipad that was sent from an iphone?

My boss has an i pad & iPhone. I tried to send him a voice memo that was recorded on my iPhone but he claimed that he didn’t see anything that he could listen to. I assume that he was on his i pad and saw my message through i message. Maybe the voice memo didn’t show up because the ipad doesn’t have voice memos? I really don’t know because I am not familiar with ipads and my boss is out of the office so I cannot look at his ipad to see. He is a little technologically impaired so there is a possibility that he doesn’t know how to use it. Any info would be much appreciated. Thanks!