Hi ,
I'm Dyari. Thanks for reaching out. I will be happy to assist you in this regard.
If you clicked Cancel, you aborted the process of copying the files from your computer to the cloud. It means your files should remain on your desktop. However, open File Explorer > Go to your system drive C: > Users > Your user profile > Desktop > Do you see the folder?
If not, check all the folders or search for a file by its name in the search box.