Problem syncing across platforms

Some but not all of my projects do not sync from my laptop to my desktop. Usually what happens is I open Creative Cloud on my laptop then open Rush. I create a project. When I try to open it later on my other computer perhaps one or two clips will be there but the others are red with exclamation points. I know if I use find and connnect I can resolve the issue but that necessitates me physically uploading the files to my other computer. I though all of this should be saved to Creative Cloud for download. Thanks for the help.