Solution to folder category loss during iTunes synchronization on different computers

I want to work on three mac and one windows. Every computer may use iTunes to synchronize songs or apps, folder category on iPhone may be lost when more than 200 apps are installed in the same step on different computers, the possible cause is that the current App list information of your device is not recorded in the iTunes library of this computer. Someone searched the internet and said that the backup was performed before synchronization. I just tried it. Summarized a set of safer practices:

For example, if you want to synchronize data on 2-5 computers and authorize iTunes on these computers, if some apps are installed after computer a synchronization, and now you want to synchronize data on computer B, first, import the app to the iTunes library (iTunes menu "file" | "transfer purches from your idevice") on B, and then synchronize the app. The key step is"Slide to cancel synchronization" on the mobile phone immediately when iTunes starts synchronization"This step is very important. "backuping..." will be performed before iTunes synchronization. At this time, the sliding device will not actually synchronize the synchronization, but iTunes will complete the backup operation. Now, you can see whether the desktop preview on the right side of iTunes is a normal folder icon structure (iPhone can only display 11 screens, and the icons that cannot be placed after synchronization will be previewed on the gray screen ). If the preview is normal, you can sync it with confidence.

To cancel synchronization, you can also click the close button in the status window above iTunes. However, at the beginning of synchronization, iTunes will be relatively slow, or slide quickly on the mobile phone.

There are also several tips:

• An Apple id can be authorized to up to five iTunes. before reinstalling the system, remember to cancel the iTunes authorization. If you cannot access the authorized computer iTunes and want to cancel the authorization for that computer, you can view your Apple id account information, which has a function to cancel other authorizations. However, this function can only be used once every 12 months. Use it with caution!
• When synchronizing an app, if you select all or cancel all, press the command key and then click any check box. On Windows, it may be Ctrl + Click.
• Copy UUID: In iTunes, click the serial number to display the uuid on the device summary page. Then, press command + C (Mac OS) or Ctrl + C (Windows) and then copy it to the clipboard.