Adobe is broken down and sad.
I do not know what happened to Adobe. Acrobat DC online will NOT let me move pages around within a document, will only let me combine a few pages to create a document, and is a shockingly poor and hollow representation of the advertised capabilities of this program. I am overpaying for a program that has features that do not function and that has fewer features than previous. You've lost a lot of credibility with me.
AdminShikhar Kohli (Admin, Adobe) commented
Apologies for the inconvenience. In case you wish to move pages in a document, can you please try using the Organize PDF tool?