Five data sources commonly used by the system:

1. Cloud data (SD data)

2. Local document: The specified file on the user's computer

3. Network file: Specified network file address

4. Folder: The specified folder on the user's computer

5. Variables

1 and 2 refer to the file data on the user's computer, which can only be used in this computer. If the user's system software changes the computer, these data will not be used.

External data is stored in the cloud, users can change computers at will, and data can be used synchronously.