Re 1:20 "The mystery of the seven stars which you saw in My right hand, and the seven golden lampstands: The seven stars are the angels of the seven churches, and the seven lampstands which you saw are the seven churches.
The word "angel" just means a messenger. To me, the seven angels here are the seven human messengers to the seven churches. If you look at the steps as to how Revelation was communicated in chapter 1 verse 1, we read this:
Re 1:1 The Revelation of Jesus Christ, which God gave Him to show His servants--things which must shortly take place. And He sent and signified it by His angel to His servant John,
Notice that Revelation came from 1) God which He gave to 2) the Lord Jesus ("Him") given to 3) an angel 4) then to John then in Revelation 1:20 given to 5) the seven angels or messengers and then 6) to the seven churches
It would seem unthinkable and unlikely for John to pass on his message back to angelic celestial beings again in Revelation 1:20 after having received it from an angel. More likely, he would have passed it on to human messengers who will publicly read it in the seven churches.
