Apple has digital reams of documentation and how-to manuals online, but the company often leaves out the details required for fully troubleshooting problems. (That’s why Mac 911 is here.) A reader asked why they were seeing an icon I’d never spotted before: an exclamation point inside an iCloud icon in a file list in iOS. After much research, I’ve concluded it shows an upload synchronization problem: an error with the file or folder prevents iCloud Drive from copying the
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