To share a document with a colleague using cloud storage, first upload the file to your preferred cloud service such as Google Drive, Dropbox, or OneDrive. Then, locate the sharing option—usually represented by a "Share" button or link—and enter your colleague's email address or generate a shareable link. You can often set permissions to allow viewing or editing, so choose the appropriate level of access. Once shared, your colleague will receive a notification or link to access the document.