added unreal migration docs

Author: andygruening

docs.json

@@ -605,7 +605,8 @@
                           "sdk/unreal/advanced/smart-contracts",
                           "sdk/unreal/advanced/utilities",
                           "sdk/unreal/advanced/advanced",
-                          "sdk/unreal/advanced/platforms"
+                          "sdk/unreal/advanced/platforms",
+                          "sdk/unreal/advanced/migration"
                         ]
                       }
                     ]

sdk/unity/wallets/embedded-wallet/setup.mdx

@@ -32,9 +32,9 @@ sidebarTitle: "Setup"
 
         If that returns `false` you should ask the user to sign. Import the `Setup` Sample from the Package Manager UI
         which will place a set of boilerplates into your project in a `Resources/` directory.
-        Create the [Login Boilerplate](/sdk/unity/bootstrap_game#login) to send a one-time password to the specified email address.
+        Create the [Login Boilerplate](/sdk/unity/bootstrap) to send a one-time password to the specified email address.
 
-        Once you’ve your first features integrated, you can continue with [additional login providers](/sdk/unity/onboard/authentication/intro)
+        Once you’ve your first features integrated, you can continue with [additional login providers](/sdk/unity/wallets/embedded-wallet/onboard/authentication/intro)
         such as Google, Apple, or PlayFab.
 
         ```csharp
@@ -46,9 +46,9 @@ sidebarTitle: "Setup"
 
     </Step>
     <Step title="Test Sequence's Features">
-        Sequence's Unity SDK includes a variety of [Boilerplates](/sdk/unity/bootstrap_game) to help you quickly start your game.
+        Sequence's Unity SDK includes a variety of [Boilerplates](/sdk/unity/bootstrap) to help you quickly start your game.
         Once everything is configured, you can create prefabs to display an Player Profile, Inventory, or In-Game Shop.
-        Checkout [how to integrate a Player Profile.](/sdk/unity/bootstrap_game#player-profile)
+        Checkout [how to integrate a Player Profile.](/sdk/unity/bootstrap)
 
         ```csharp
         BoilerplateFactory.OpenSequencePlayerProfile(parent, wallet, chain);
@@ -61,7 +61,7 @@ sidebarTitle: "Setup"
     </Step>
     <Step title="Integrate it on your own">
         Start with the `EmbeddedWalletAdapter` to quickstart your integration with a few one-liners and you are ready to go.
-        When you want to customize your integration, checkout our other docs such as [authenticating users](/sdk/unity/onboard/authentication/intro) or [how to send transactions.](/sdk/unity/power/write-to-blockchain)
+        When you want to customize your integration, checkout our other docs such as [authenticating users](/sdk/unity/wallets/embedded-wallet/onboard/authentication/intro) or [how to send transactions.](/sdk/unity/wallets/embedded-wallet/blockchain-interactions)
 
         ```csharp
         EmbeddedWalletAdapter adapter = EmbeddedWalletAdapter.GetInstance();

sdk/unreal/v1/migration.mdx sdk/unreal/advanced/migration.mdxsdk/unreal/v1/migration.mdx renamed to sdk/unreal/advanced/migration.mdx

@@ -1,7 +1,31 @@
 ---
-title: "Migrate from v1 to v2"
+title: "Migrate from a previous Major Version"
+sidebarTitle: Version Migration
 ---
 
+## From v2 to v3
+
+### Unreal Engine Version
+
+Starting with v3, we are not supporting Unreal Engine 5.2 and 5.3 any longer. Please update to Unreal Engine 5.4 or later.
+
+### SequenceWallet class
+
+When you used the `SequenceWallet` (C++) or `SequenceWalletBP` (Blueprint) classes in 2.x.x, those referred to our Embedded Wallet Architecture.
+If you’re using version 3, use the `SequenceEmbeddedWallet` (C++) and `SequenceEmbeddedWalletBP` (Blueprints) classes instead.
+`SequenceWallet` classes now refer to our Ecosystem Wallet architecture.
+
+### Large Numbers (BigInteger)
+
+When defining values such as tokenId, amount, or chainId, they were previously referenced as `uint64`.
+This imposed a limitation, because uint64 cannot represent the full range of `uint256` values used in blockchain interactions.
+
+We have now replaced all BigInteger references with string types. Please update your code and Blueprints to reflect this change.
+
+If you need to perform mathematical operations on BigIntegers, use our `FBigInt.h` class in C++.
+
+## From v1 to v2
+
 Sequence Unreal SDK v2 adds a lot structural improvements. Here is everything you need to know on how to migrate
 from a previous 1.x.x version. If you have any questions or concerns, please reach out to us.