1, enter I housekeeper-space cleaning, and clean up the garbage cache;
2. Enter the file management to delete unnecessary files (installation package, video, compressed package, etc.). );
3. Go to Settings-Applications and Permissions/More Settings-Application Management-Find the corresponding software-Store-Clear the cache;
Note: Before deleting files, software and clearing all data, please back up the data in advance to avoid losing important data.
Other models support SD card installation: enter file management-phone storage/memory/all files-long press to select files-cut-enter SD card-paste, so that files can be moved from memory to SD card, and vice versa.
Note: Installing software on SD card is not supported on any model after Android 6.0.
If you still have more doubts, you can enter vivo official website-My-Online Customer Service-Enter labor and consult online customer service feedback.