I clicked the transfer notes from MN3 in MN4. One of my MindMap Notebook somehow disappeared!
I can’t find it anywhere. I’ve checked the trash bin, the find lost notes section, historical archives and my iCloud. I’m pretty sure I’ve synced it to iCloud before but it’s not there either. It literally disappeared 
The corresponding Doc Notebook is still there.
Do anyone have the same problem? Please help. The notebook means a lot to me.
Hello
Do you still keep the mn3 data, it is recommended to use a full backup file and then use mn4 to open this file, which is more suitable for all devices and large databases
Kind Regards,
Support Team