You should have played "Floating Secret Realm" before. One of the more troublesome things is the list of upgrade gift pack codes for "Floating Secret Realm". If you really don't know how to use the "Floating Secret Realm" upgrade gift pack code, you can read this guide. Please read it carefully. It doesn't look difficult at all, just follow the guide, it's very simple.
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1. In the main interface of the game, find the personal character information and select the "Settings" button.
2. Enter the setting interface, you can see the "Redeem Code" button, enter it.
These contents are summarized by the editor's fact sheets. I believe they can answer your questions on this issue. There are more high-quality guides about the floating secret realm on this website, you are welcome to check them out at any time.