Does progress carry over between servers?

There are no character transfers between regional servers, so your first choice matters. You pick a server right after logging in, as one of the first decisions in the game, and character creation starts immediately afterward. Everything you build from that point lives on that server alone.

If you move to another server, you start from the beginning with a new character. Your old character stays where you left it. Trying a different region costs you time but not your original save, which is still there when you go back.

Switching platforms is not switching servers

Aniimo supports cross-play and full cross-save across PC, PlayStation 5, Xbox Series X/S and mobile. Progress is shared when you log into the same Aniimo Pass account on the same server. Accounts are linked through the same email address, and on PlayStation you also link a PSN account.

That means you can sync an existing account from another platform to the mobile version. A PC account can log into mobile with your player level carried over. Moving between devices keeps your progress. Moving between servers does not, because data on different servers stays independent even on a linked account.