Creative Cloud desktop

We can't know, either. You have not provided any proper system information or other technical details.

Mylenium

File Sync Links that may help... all the links I have, since I don't know your specific problem

-https://forums.adobe.com/community/creative_cloud/host_sync

-http://helpx.adobe.com/creative-cloud/help/sync-settings.html

-http://helpx.adobe.com/creative-cloud/kb/arent-my-files-syncing.html

-Size Limits https://forums.adobe.com/thread/1488242

-sync and email link http://forums.adobe.com/thread/1427516?tstart=0

-Phantom folder problem https://forums.adobe.com/thread/1490445