As of today it is not possible to share files via creative cloud. Not from your online envorinment, nor frome filebrowser. NOT browser related. Seems server sided. FIX ASAP.
PRO TOP: TEST before you change the software and decide to enroll <-- i've actually learnt this at school; try it! If it's too hard: try calling your customer service. They have a checklist ready for you. Very helpful