Release Notes

3.0.0

Preview

Build 1118 (Apr 20, 2026)

Improvements

• Add the ability to set the "Local State Copy Mode" of an actor to "Manual" in order to prevent potentially expensive copy operations every frame for an actor the client can modify. Using this mode found on the UFusionActorComponent requires the user to call UFusionActorComponent::CopyLocalStateNextFrame() in order to trigger a copy of the state of an Actor next frame. Copying the state of the actor allows other connected clients to receive the replicated changes
• Performance improvements related to detecting transient objects

Build 1112 (Apr 16, 2026)

Improvements

• Performance improvements in the core Fusion library related to strings

Bug Fixes

• Fixed: Issue where StartFusionSession() with a valid InitialWorld would not trigger a map load

Build 1108 (Apr 13, 2026)

Improvements

• Performance improvements in the core Fusion library. Including working with strings and ownership methods

Bug Fixes

• Fixed: Sub objects would trigger unnecessary data to be sent

Build 1100 (Mar 25, 2026)

Bug Fixes

• Fixed: Replication issue with PlayerState actors

Build 1088 (Mar 24, 2026)

Breaking Changes

• Renamed: UFusionActorSettings to UFusionActorComponent

Changes

• Trying to connect while being connected is failing the connecting instead of tearing down the session and starting a new one
• Trying to join a room while being in a room is failing the joining instead of tearing down the session and starting a new one
• Added ClientTravel to FusionSubsystem, this is to handle map transitions when running under one process, this is a known unreal bug

Bug Fixes

• Fixed: Region Select Mode "Select" was timing out
• Fixed: Issues with AttachCurrentMap, ensure connecting clients (none master) are put into correct state before attaching
• Fixed: Make sure we clear all related objects in OnMapDestroy
• Fixed: Add missing rpc type handlers, caused a crash
• Fixed: Make sure APlayerState is properly replicated and survives map transitions

Build 1011 (Mar 12, 2026)

• Previous SDK versions are no longer compatible with deployed infrastructure. Please update to this build or later

Breaking Changes

• FFusionRoomOptions does not have an InitialWorld property anymore, set the InitialWorld when calling UFusionOnlineSubsystem::StartFusionSession()
• EActionFailureCodes changed and numeric values for enums changed
• UFusionClient::IsConnected() was removed, use UFusionOnlineSubsystem::IsConnected() or UFusionRealtimeClient::IsConnected() instead
• FTimerState was renamed to FFusionTimerState and was moved to FFusionTimerState.h
• The SharedMode::Logging namespace is now in the PhotonCommon namespace
• The SharedMode::CharType and SharedMode::StringType types are now both in the PhotonCommon namespace
• Update plugin code to follow Epics guidelines
• Removed unused RoomName Argument from JoinRandomRoom

What's New

• A new Realtime Matchmaking API was added that replaces the old connection methods, providing full access to Photon Realtime related features
• A LeaveRoom blueprint node was added to leave a Realtime room without disconnecting
• Added support for dynamically adding and removing replicated actor components
• Improved AOI system
• Added a new "Player Attached" ownership mode which means the player actor will be destroyed when they disconnect
• Ability to connect ongoing world to fusion via UFusionOnlineSubsystem::AttachCurrentMap()

Changes

• The Fusion Session is not started automatically when joining a Realtime room anymore, call UFusionOnlineSubsystem::StartFusionSession() to start a Fusion Session after joining a room

Bug Fixes

• Fixed: Prevent erroneous error logs being generated when the non-master client code loads the map via the OnMapLoadPerform callback
• Fixed: Uninitialized memory caused the frame update to never run
• Fixed: Class properties when used in RPCs
• Fixed: Ensure InitialMap loads properly
• Fixed: Update service while in shutdown to allow us to receive the disconnect status
• Fixed: Harden disconnect
• Fixed: Add physics state delta checks to avoid unnecessary network sends
• Fixed: Potential issue when using "Standalone Game" launched from the editor
• Fixed: Potential crash and log spam when leaving a Photon room

Build 835 (Feb 19, 2026)

Bug Fixes

• Fixed: Closing a standalone window sometimes caused a crash
• Fixed: A player would sometimes fail to spawn properly after joining a room at start-up in Unreal 5.4

Build 760 (Feb 12, 2026)

Bug Fixes

• Fixed: Adjust a number of Fusion Blueprint nodes so that the main input parameter defaults to self as they did previously: HasOwner, GetOwner, GetResolvedOwner, IsOwner, CanModify
• Fixed: Fix issue where remote Pawns were being assigned the local PlayerController. Remote Pawns no longer have a PlayerController set

Build 756 (Feb 11, 2026)

Bug Fixes

• Fixed: Fix closing PIE instance crash
• Fixed: Fix issues in seamless travel

Build 720 (Feb 10, 2026)

Breaking Changes

• Correct spelling of "Recieve" to be "Receive" for Fusion RPC functions. Fusion C++ RPC functions need to be renamed from *_Recieve to *_Receive
• Previous SDK versions are no longer compatible with deployed infrastructure. Please update to this (build 719) or later.

What's New

• Add support for using Actors, Objects, Classes as RPC parameters
• Connecting to the Photon Cloud supports now choosing the best region based on the players ping
• All edge cases around object life cycles should be solved to provide more consistent replication
• Android support and crossplay support between Android and Windows
• Removed interpolation of replicated properties, the behaviour of Fusion now matches unreals netcode more closely in several regards.
• Property RepNotify's now supports previous value argument.
• Native remote function calls now supported in both blueprint and c++, see documentation for further details. RPCs In Depth

Improvements

• Improved physics prediction and replication further
• All public code should now conform to the unreal formatting standard
• Fusion can now use "Run Under One Process" mode in unreal editor

Bug Fixes

• Fixed: Fix issue where a client may not be reliably informed of an object having its owner removed
• Fixed: Fix a potential issue where an actor would not be properly replicated if it is part of a map and immediately possessed
• Fixed: Prevent an assert triggering when loading into level when using UE 5.4.4
• Fixed: Manually set netdriver world
• Fixed: Issue with map loading when loading the same map again
• Fixed: Map actors now use a consistent hashing for identifying sub components which removes the need for consistent component order on all connected clients.

Build 492 (Jan 12, 2026)

What's New

• Unreal 5.7 support

Bug Fixes

• Fixed: Native pointer usage in member declaration preventing a shipping build

Build 438 (Dec 18, 2025)

Breaking Changes

• Previous SDK versions are no longer compatible with deployed infrastructure. Please update to this (build 438) or later.

What's New

• Added full support for the Character Movement Component
• Added internal "string heap" replication system for string and text data
• Added support for networking GameInstance and calling Fusion RPCs on it
• The Actor Role now reports to be either Authority or SimulatedProxy based on whether it can be modified
• The NetMode now reports to be a Client

Improvements

• Object replication model has been updated to reduce bandwidth and improve type support

Bug Fixes

• Fixed: Issue where a replicated Actor reference set to None/nullptr by the authority would not be correctly set on remote clients
• Fixed: Duplicate CreatedLocal existed on derived RootObject, hiding other implementation
• Fixed: RPC regression fix, datatypes not properly serialized
• Fixed: IsOwner and CanModify was not properly evaluating all conditional branches
• Fixed: Race condition on sub-object system during object destruction

Build 354 (Nov 25, 2025)

Bug Fixes

• Fixed: Prevent crash and add error log when running multiple PIE windows in one process

Build 349 (Nov 24, 2025)

• Initial release

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