Store in iCloud
If a file is stored in iCloud Drive, you’ll be able to access it from any Apple device that’s signed into your Apple account, and computer or mobile device with a web browser by logging into iCloud.com and signing in.
To access your iCloud Drive from your Mac, open a Finder window and click iCloud Drive in the sidebar. There are already folders in there, for apps such as Pages, Numbers and Keynote. You can also create new folders and drag files into and out of iCloud Drive just like you would with any other Finder window.