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Unity3D Particle system on UI wont display in build

I have followed this particular tutorial: https://www.youtube.com/watch?v=ir9Rvi1QG8Y to add a particle system effect on a UI panel. It works well in scene mode and game mode but when built for android no particles are shown. I have tried tweaking the particle shader, material etc.. but to no avail. What do you recommend please? Thanks.
Unity version: 2018.2.11f1
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After recreating the project myself I've found out that its because of a sloppy code in UIParticleRenderer class.
Shader foundShader = Shader.Find("UI/Particles/Additive");
in line 79
when you try the game in Editor "Find" method works correctly, but when you want to publish it to a device (android) it won't include "UI/Particle/Additive" shader so the shader won't be found.
there are 3 solutions to this problem as described for Shader.Find class in Unity documentation :
reference it from some of the materials used in your scene
add it under "Always Included Shaders" list in ProjectSettings/Graphics
put shader or something that references it (e.g. a Material) into a "Resources" folder.
I used the 2nd solution (which is easier to do) and it solved the problem. so you can go to Edit->Project Settings->Graphics and under "Always Included Shaders" section Add "UI Particles Add", then build and run your project.

Image as a Texture in HoloLens -Issue

Good evening,
Recently I was trying to create an app in Unity where with a button I could open an image or a pdf while the app remains open and running. I tried to do it with Unity, and I didn't see any problem. However, when I used the HoloLens emulator, every time I did it the app opens the file but then closes.
I thought that maybe if I defined several 2D Empty Objects (as Images, Raw Images...) the app would still run while doing this. To do this, I used the WWW class and the example of the Unity Scripting API.
https://docs.unity3d.com/ScriptReference/WWW.html
However, I don't know why when I run the app the Image doesn't change... I also tried the SetTexture() method it still doesn't work. So I was wondering if you have encountered the same problem, and if you could help me to solve it out.
Thanks a lot for your help!
Best Regards

I'd suggest looking up the following post: change texture
It comes down to defining a gameobject, making a prefab out of the Image and setting the material of the prefab. You can easily make new materials by importing an image or making one using projects tab>Create>Material. You could try making 2 Materials with different colors to test it.
It could also be code that needs to be run using UWP outside of the editor, if that's the case, you could use
#if !UNITY_EDITOR
//Put your code here.
#endif

Getting Movement with Google Cardboard in Unity

I want to put a scene in Unity into virtual reality using Google Cardboard.
I used to be able to just drag a CardboardMain prefab into the scene, delete the main camera, use CardboardMain as the camera position, and CardboardHead to track where the user was looking.
After reading the release notes for the new updates, I thought I could drag a GVREditorEmulator and GVRControllerMain into the scene, and keep the normal camera.
Unfortunately, I can't figure out how to get the camera to follow my character with this new setup. (In this case, a rolling ball.)
If I change the position of the normal camera, it looks like it works fine in Unity, but as soon as I upload it to my phone, the user stays in the same place, while the ball rolls away. (The user can still control the ball's movements, but the camera/user doesn't follow the ball at all.)
I had thought that the chase cam demo would be useful, but that's only for Daydream, and I'm using Cardboard.
This trick seemed to work for some people. I tried in on a previous version of Unity and a previous version of the SDK and it did not seem to work. I may just need to try it on this new version, but I'm worried about going into the released code and editing it, so I'd prefer answers that don't require this.
Is there any way I can get the user to move in a Google Cardboard scene in Unity when I upload it to my iPhone?
UPDATE:
It looks as though my main camera object is not moving, making me think that something is resetting it back to the center every time, lending some more credence to the "trick" earlier. I will now try "the trick" to see if it works.
UPDATE: It doesn't look like the lines listed in the "trick" are there anymore, and the ones that are similar in the new program don't even seem to be running. Still trying to figure out what continues to reset the main camera's position.
UPDATE: Just got a response back from Google on GitHub (or at least someone working on the SDK) that says "You just need to make the node that follows the player a parent of the camera, not the same game object as the camera." I'm not exactly sure what that means, so if someone could explain that, that would most likely solve my problem. If I figure it out on my own I'll post back here.
UPDATE: Zarko Ristic posted an answer that explained what this was, but unfortunately the tracking is still off. I found out how to get Google Cardboard to work with the old SDK and posted an answer on that. Still looking for ways to get the new SDK to follow a character properly.

You can't change positioin of camera in cardboard application, position of MainCamera it always must be 0,0,0. But you can just simply made empty GameObject and make it parent of MainCamera. In Cardboard games actualy you can move parent of camera instead MainCamera directly.
Add script for tracking ball to MainCamera parent (GameObject).

This does not answer my question, but is a solution to the problem.
Do not use the newest version of the SDK. Use version 0.6
When building the app in Unity, do not select to have VR enabled under the build settings. (VR will still be enabled in the app.) (Credit: Zarko Ristic)
When putting the app onto your phone, if XCode prompts you to change any settings, you can ignore it.
In addition, disable bitcode under "Build Settings -> Enable Bitcode -> No" (Currently, this will not allow you to put your app onto the app store. I would greatly appreciate it if anyone has information on how to get it to run without doing this.)
Now your app should run on your phone correctly.

Vuforia 6.2.2 Unity 5.4.4 Camera does not work

Everyone.
Vuforia Camera does not work, but only black screen on Android 6.0+ versions.
Vuforia Version is 6.2.2 and Unity version is 5.4.4
But vuforia camera works on less than android 5.0
How can I fix this issues?
I hope you to teach me about this.

This is an interesting problem I have and there is an unacceptable temporary fix I am using while testing this system out. For the iPhone 7, to get past this suspend the app and then return to it. After about 2 seconds the camera will work. I am guessing it will work similar for android. I will update with a better fix if I come by a real fix after my testing if I decide to use this system.
Edit:
Short answer:
Delete the meta data for any pre-existing custom camera controller script. If you are using your own camera controller you need to disable the vuforia one and delete the meta for that. You are basically hijacking the camera feed after it starts.
long: I began this application by building out my own system and to test vuforia I disabled these items (like the camera feed). I went through the logs and saw that even with these items disabled the camera feed was still running and this feed started AFTER the vuforia camera so basically my own start() methods (even though they were disabled) were hijacking the camera from vuforia. It turns out that my meta data for my camera controller script was still poised to run the script even though everything was disabled. After deleting my camera controller script meta data it worked fine. You can also just delete the camera controller and it will delete the meta. By camera controller I mean my custom written camera controller that was built before I added in vuforia. This is a hard to find fix because it works fine in unity, but not when you build out to a device. The meta doesn't seem to update for the device, just the unity engine.
If you are using the vuforia camera make sure you either use the vuforia plane that comes as a child of the camera or delete the meta data to whatever camera script you wrote. You should get camera feed in a new empty project just by dropping in the vuforia camera, there is no need to build your own script and if you do, make sure one isn't overriding the other like mine was.
If you want to simply test to make sure it isn't your device or code create a NEW empty unity project, import vuforia (no need to import the database, just the sdk) and then drop the vuforia camera into the project and test it. Don't add anything extra or do any image recognition. If this works, it's your code somewhere.

I am using Vuforia 6.2.10, Unity 5.4.4.f(64 bit) and a Nexus 7 Android 6. I had the same issue where the camera was black. I started over, adding one component at a time. The AR Camera alone worked fine. Adding a Target Image also worked. I added a plane and image to the TI and the camera failed to work. Setting the image texture type to Sprite 2d and ui seemed to help.
I discovered that by deleting the app from the device and creating a apk file each time it worked.
I am not sure I'd count on Vuforia in the near term.

how to create a responsive scene

I'm currently creating a 2D Android and iOS game using Unity3D engine. I'm testing the game on a nexus 5, and an iPhone 5s device. Everything until now is working fine and I am pretty happy with the result, but when I test that application on an iPad or a Samsung tablet all the objects in my game scene are not in the correct position anymore. Is this a common problem in Unity3D ?
I know I am missing something but I tried to do some research and what I found is only by changing the orthographic camera scale might fix this problem, but I found it as a big amount of code to write as my game have not only one scene but multiple scenes and every scene have it's own game objects.
Is there any other method to do, a good and simple work around for this problem?

It's all about setting the Anchors right.
If you're using the new UI System, make sure you anchor the objects where you want them to be, that's how you will achieve resolution independence.
For more information about anchoring, see this tutorial

Don't have separate scenes for separate devices. You can use the Screen object to check the height and width of your display. Then you can use this to set the orthographic size of your camera to something that makes everything visible as expected.

Update: I misunderstood your question, you say GameObject, i understand UI.
Please check this. I don't have this issue on my game. But when i try it with mac or windows machines, it is problematic. So maybe this can solve.
Other solution is more common which is you and Agumander say, change orthographic size of Camera.
This Is for UI
You can use Unity UI, and don't need to seperate. There are so many different resolution and density devices, you need to create so many scenes. So it is meanless separating scenes.
Unity UI has pixel based solutions which can be very helpfull for many density and resolution options. Forexample, It has VerticalLayoutGroup and HorizontalLayoutGroup for easy list like element visulation.
Most important thing is: Do you want to change UI for different screen size or resolutions? For example iPad has larger screen so user can be see more content. This change UX. Maybe you need to consider this.