Functions of IOS documents, library, and TMP

1. Documents:

Only files generated by the user, other data, and other files that cannot be re-created by other programs should be saved in the <application_home>/Documents directory, and will be automatically backed up through iCloud.

2. Library:

Data that can be re-downloaded or re-generated should be stored in the <application_home>/library/caches directory. For example, the cached database files and downloadable content used by magazines, news, and map applications should be saved in this folder.

3. tmp:

Only temporary data should be saved to the <application_home>/tmp folder. Although iCloud does not back up these files, you must delete these files at any time after the application uses the data to avoid occupying the space of your device.