To move data from internal memory to external memory on Vivo X6, you can follow these steps:
1. Go to the settings app on your phone.
2. Scroll down and tap on "Storage & memory" or "Storage".
3. You will see the storage information of your phone. Tap on "Internal storage" or "Phone storage".
4. On the storage detail page, you will see a list of apps and files taking up space on your internal memory.
5. Tap on the app or file that you want to move to external memory.
6. You will see an option to "Move to SD card" or "Move to external storage". Tap on it.
7. Wait for the process to complete. It may take a while depending on the size of the app or file.
8. Repeat the process for other apps or files that you want to move to external memory.
Note: Not all apps or files can be moved to external memory. Some apps or files are necessary for the system to function properly and cannot be moved. Also, make sure that you have inserted an external memory card in your phone before attempting to move data to it.