Prefabs not visible in unity scene - unity3d

I bought an asset from unity store and installed XR interaction toolkit therein. Everything works fine. When I drag prefabs from another asset into the scene and deploy it into oculus quest 2, these prefabs become invisible.
I have tried giving these prefabs the same properties as that of the visible objects in the scene but nothing is working for me. does anyone have an idea of what I'm doing wrong?
I also created a game object (cube) but it's not also visible when I deployed it. This suggests that the problem is not the prefabs that I'm trying to add to the scene

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Unity GameObject disappears after turning it into a prefab

I am making a 3d game in Unity for a school project and I have followed several online tutorials. I made a simple door in Blender, imported it to Unity, and placed it in the scene and it worked fine, but then after I made some minor changes to it and then placed the new finished door object into my assets, the door object "disappeared". The object is still there in the scene hierarchy but it does not show up in the scene or game view. Instead, it is just an outline if selected and is otherwise not visible. Outline of object
I looked online and could not find any similar occurrences and could not find any, so I tried unpacking the object (which I did not expect to do anything) as I am very new to Unity. I also tried placing the object into a new scene, and later a new project, but both did not work.

When I load New Scene With SteamVR_LoadLevel All Controllers Freezing

Hey i am working on VR application with unity. I have got some scenes in my project. Everythings are fine first scenes. There is a level i am using a "Player" prefab and when i start a load new scene with SteamVR_LoadLevel .Begin function, next scene loading finely and my HMD running good but the controllers freeze. I am CameraRig in next scene and i destroy Player [SteamVR] gameobject before scene with checkbox (unchecked) inside of inspector.
I was try Unity SceneManagement, or other things but i can not find a solution. By the way if i run that scene directly, every controller working fine.
Waiting your answers thank you.
I can not find solution on this problem but i change my GameObjects. I think if you use Player prefab previous scene and if you use CameraRig inside next scene then controllers freezing. Because vr action setup not same (or broken) for CameraRig. When i realized this situation, i change my CameraRig object to Player prefab. If you accept, this is my solution.

Unity 3D Shader Doesn't appear on VR mode

We have two scene, in one scene we create level design and mechanics for VR in runtime, and other scene we use SteamVR for VR mode. Shader show up in editor scene but doesn't work in VR scene.
Thank you for your answers,
Actually it was a save load problem. We use 3th party asset from unity asset store (Runtime Save & Load) and SceneAssetLibrary.asset that hold scene asset references was overwritten when worked on scene. So we revert that file thus it worked again.

Unity 3D Cannot drag prefabs from project folder to scene

On Unity 5.3.4f1 when I try to drag any prefab (for example the standard asset FPSController prefab) from my Project folder onto the scene or Hierchay I get no response.
The prefab isn't placed and my cursor stays in pointer mode throughout.
This happens to me on all sample and new projects with and without an empty scene.
My Unity is on a MacBook Pro running El Capitan 10.11.3
This happened with me sometimes, one way to solve this is to create a empty prefab manually. In case you don't know how to do it
GameObjects -> Create Prefab
Tell me if it helps.

Unity not loading project properly

Me and some of my mates work together on a project in Unity. When I try to load the project, one of them gave to me (via Dropbox or USB-Stick, doesn't matter), I keep seeing the empty Hierarchy-window (I don't even see a main camera), although he created some objects in the scene.
The scene is definetly loaded in the editor, the name of the scene is shown at the top of the editor. I am not even able to instantiate a prefab in that scene, prefabs from the project are shown with a grey file-symbol, not with the normal blue "prefab-symbol".
By the way: We are using Unity 5.0.x
I hope you have a solution for my problem :)
The problem was a wrong setting of the meta-files and a version-conflict of Unity. The project was created with Unity 5.0.0, opening it with Unity 5.0.1 did not work.