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For Multi-user collaborative experience, it is recommended to leverage Azure Spatial Anchors for local users and Photon SDK for syncing the content/state in the scene. For now, our Documentation provides this step-by-step guide instruction for integrating the Azure Spatial Anchors service into an Unreal project: Azure Spatial Anchors in Unreal. However, For Photon it is a non-Microsoft product, so the Getting Started guide with Photon should provide on the Photon official site.
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