The phone prompts that the memory is full/insufficient or needs optimization. I suggest you: 1. Open smart manager-storage space/storage, clean up unnecessary data such as cache. 2. Open galactic space-diagnosis-erasing memory/storage &; Optimize settings and clean them up. 3. It is recommended to transfer the photos and videos stored in the mobile phone to the SD card or computer regularly. 4. Delete the software or files that are not used for uninstallation. If the memory of the mobile phone is still insufficient after the above operation, it is recommended to back up data (contacts, information, photos, etc.). ) and try to restore the factory settings.