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It is very easy. You can just send the people you want to share a file with a link to that file.
1. Click on the “Share” icon in the toolbar (I assume you are using a Mac).
2. Select “ Share link via iCloud” and then select the option you want (email, twitter, etc.).
3. Fill in the requested information (email addresses).
If you need more detailed instruction, check HERE on Apple’s support website.