You can rotate pages with Acrobat but not Adobe Reader.
Reader supports rotation of the page "view" which is not a page rotation.
So, open the PDF with Acrobat. Open the Pages pane to view the page thumbnails.
Select and rotate desired pages then do a "save as" of the PDF.
Close the PDF.
Go online and sign into your files.acrobat.com account.
Upload a copy of the PDF to the account.
Be well...