The linking process is explained below by scenario:
Scenario 1:
You already have game progress on iOS, Android, or PC and want to link it to a PSN account that has never logged into the game.
How to link:
On PlayStation®, launch the game for the first time using a PSN account that has not previously logged in. Follow the on-screen prompt to link the email address of an existing Gryphline Account.
*Note: The linking prompt appears only when the PSN account logs into the game for the first time and accepts the user agreement. You can link an existing Gryphline Account only through this prompt. If you skip the prompt and choose quick login instead, the PSN account will automatically register a new Gryphline Account, making it impossible to link to another already registered Gryphline Account email.
Scenario 2:
You already have game progress on PlayStation® and want to link it to an email address that has not been registered as a Gryphline Account.
How to link:
Log in to the game on PlayStation®. Go to Settings → Platform & Account → User Center → Link Email, then link an email address that is not registered with a Gryphline Account using your current PSN account. Once the linking is complete, you can log in on iOS, Android, PC, or PlayStation® on the same server with this account, and your game progress will be shared across platforms.