I saw the Messenger of Allah ﷺ performing his voluntary prayer in whichever direction his she-camel was facing.
حدثنا ابن نمير حدثنا عبيد الله عن نافع
رأيت رسول الله ﷺ يصلي سبحته حيث توجهت به ناقته
Its chain of transmission is sahih. It is an abridgment of 6155, and see 6224.