iCloud data storage deletion
On iOS

You can go to Settings > General > Usage > Manage Storage. You can then select an app that you wish to remove iCloud data for, tap Edit, then delete the data that you no longer need on iCloud.
(Some apps only have a Documents &amp; Data section - this means that it will remove all data from iCloud, without any option of selecting individual files.)



On Mac

You can go to ~/Library/Mobile Documents and delete individual apps/files there.