QLThumbnailError.Code.generationFailed The thumbnail couldn’t be created for the given file. Declarationcase generationFailed See AlsoError CodesQLThumbnailError.Code.noCachedThumbnailQLThumbnailError.Code.noCloudThumbnailQLThumbnailError.Code.requestCancelledQLThumbnailError.Code.requestInvalidQLThumbnailError.Code.savingToURLFailed