setupiCloudDocumentSyncWithUbiquityContainer starts the sync

[jidesoft]

The setupiCloudDocumentSyncWithUbiquityContainer needs to be called when the app starts. However, I noticed this method will start the sync the files with iCloud automatically. To make it worse, it syncs on the main thread and block the whole UI for a few seconds. Is there a way to turn off the auto-sync when calling this method? Thanks.