Imagery Loading Failure in CesiumforUnrealVRTutorial on PC with HTC Device

Hello! I am currently learning to use the VR case project CesiumforUnrealVRTutorial of CesiumForUnreal and have encountered a problem. When running this project in the Unreal 5.2.1 editor, everything works fine, and both the terrain and imagery can be loaded smoothly. However, when I package the project for the PC platform and view the scene using an HTC device, I find that only the terrain is loaded, and the imagery fails to load. I am very confused and have no idea what has caused this situation. I sincerely hope that you can help me analyze it. Thank you very much!