When I saw him, I fell at his feet as though dead. But he laid his right hand on me, saying, Fear not, I am the first and the last, and the living one. I died, and behold I am alive forevermore, and I have the keys of Death and Hades. Write therefore the things that you have seen, those that are and those that are to take place after this.
Jesus is speaking here.
The first and the last, the one who died and alive evermore.
That is NO angel.
Well now if Christ were speaking here then the Book of Revelation would be the Gospel of Revelation wouldn’t it?
The Angel told John what to write, and so he spoke the words given by Christ.
Christ never told his disciples to write Scripture, he told them to teach and preach all that I have taught you.