I do not think that aliens built the pyramids. I believe that they were constructed by the Egyptians.
Firstly because the existence of aliens is still not fully dokazano.Tak also the very fact that they were constructed by the Egyptians, because they have lived there to this day.
Secondly, there are various abrasive materials Egyptians inside the pyramids and there is shown how to control the slaves and forced to build them.
Finally, everyone has a different opinion, nothing is proven accurate. Still, I am inclined to release with the Egyptians because it is more realistic.