Unity Does Not Load Some Of The Modeling Objects

I'm working on a project in Unity 5 and I'm facing a weird problem! My problem is that some of the 3Ds Max files does not load in Unity. I mean I can't insert them into the scene and I don't know why!

Here is the print screen:

As you can see I have 3 models here but none of them can be inserted into the scene somehow... So do you know how to solve this problem ? thx

I've never used the .max files directly, but there can be more caveats than you think. According to the official forum there are some requirements to .max files:

• A licensed copy of that software must be installed on all machines using the Unity project
• Files can become bloated with unnecessary data
• Big files can slow Unity updates
• Less validation, so it is harder to troubleshoot problems

The latter one really concerns me. Try to export your models as .FBX - maybe you even could see errors and warnings while exporting.

Also check again these documentation links: https://docs.unity3d.com/Manual/HOWTO-ImportObjectMax.html https://docs.unity3d.com/Manual/class-Mesh.html