I just created new project from First Person Template, and added FPS Weapon Bundle.
Then, skeletal mesh from the FPS Weapon Bundle shown in the selection list.
So…
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How did you add “first person content pack”? I added the FPS Weapon Bundle from Epic Games Launcher, not inside of Unreal Editor.
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Is your skeletal mesh included in the project? After I added FPS Weapon Bundle, I can see the meshes in content browser.
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By the way, this sub-forum(international/japan) is meant to discussion in Japanese language, like “こんにちは”. Probably “general discussion” is better for discussion in English. General Discussion - Unreal Engine Forums