The LUT file should be in .cube format and the size of the file should be 17 or 33.

iOS Devices:
Method 1: Import the LUT file through an online chat or AirDrop.
Method 1: Import the LUT file through an online chat or AirDrop.
- Download the LUT file to your computer.
- Send the LUT file to the iOS device via an online chat (like WhatsApp) or AirDrop.
- Open the LUT file using the HollyView app.
Method 2: Copy the LUT file to the 3DLUT directory of the HollyView app.

Android Devices:
- Download the LUT file to the Android device.
- Open the HollyView app, choose the LUT option, and select Add a new file.
- Choose the downloaded LUT file.