
Open the problematic Keynote file from iCloud on another Mac device, make a small change on it like adding a word, and then allow for the changes to be synced on iCloud.Quit Keynote completely by pressing Command + Q on the open window of the app.The most common document can’t be opened on macOS 10.14 errors messages are caused by syncing errors. Fixing keynote macOS 10.14 Errors Caused by Syncing Errors But when the file is corrupted, and there is no other backup copy of the file left, the user can use the iWork recovery software to recover the file. If the cause of the error message is the alteration of the file's extension, a user can resolve such macOS 10.14 keynote file can’t be opened error quite swiftly by restoring the file's extension to its original form. Fixing Keynote Errors Caused by Faulty Extensions or File Corruption But the stored files may become lost or altered as a result of some mixups in cloud processes, resulting in the display of the error messages described above. Keynote is designed to store documents in iCloud and make them accessible to the user at any point in time. When trying to access a backup copy of a keynote file that was worked on recently, a user may be faced with an error message that reads "Filename.key can't be opened because it is an invalid keynote document" or "The operation couldn't be completed (Librarian Error Domain error 1 - Unable to initiate item download.)", or other similar errors. Try It Free How to Fix Keynote Cannot Open File Microsoft Excel for macOS 10.14 Crashes.

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