UT-3642 Update FBX SDK Bindings (#537)

Update fbx sdk version, bump exporter package version, update changelog for 3.2.1-preview.1

Author: natalia-wh

CHANGELOG.md

@@ -1,5 +1,21 @@
 # Changes in Fbx Exporter
 
+## [3.2.1-preview.1] - 2020-08-05
+### Added
+- Add an export option to preserve model import settings when overwriting an fbx file.
+- Add the option to export FBX files outside of the Assets folder.
+
+### Changed
+- Renamed label in Autodesk® Maya® from Unity Fbx Namespace to Strip Specific Namespace.
+- Renamed Export as FBX Linked Prefab to Export as FBX Prefab Variant.
+- Mesh instances are now exported as instances of a single mesh instead of exporting multiple, identical meshes.
+- Updated to latest com.autodesk.fbx (3.1.0-preview.2).
+
+### Fixed
+- No longer initiate export if no objects are selected in Autodesk® 3ds Max®.
+- Added a null check for bones, so export no longer fails if a skeleton has missing bones.
+- Fix incorrect relative paths for textures in FBX files.
+
 ## [3.2.0-preview.2] - 2020-05-19
 ### Added
 - Added an option to the Autodesk® Maya® integration Unity menu for creating an export set.

com.unity.formats.fbx/Documentation~/images/FBXExporter_MayaExportSetAttributes.PNG

@@ -6,7 +6,7 @@ The FBX Exporter package includes the following features:
 
 * [FBX Exporter](exporting.md): Export geometry, animation, Lights, and Cameras as FBX files so you can transfer game data to any 3D modeling software. Record gameplay and export it to make cinematics. Start grey-boxing with [ProBuilder](https://docs.unity3d.com/Packages/com.unity.probuilder@latest/), then export your GameObjects to FBX until you can replace them with the final Assets.
 
-* [FBX Linked Prefabs](prefabs.md): The FBX Importer allows you to import an FBX file as a **Model Prefab** and create **Prefab Variants** from them. Since Prefab Variants can override properties and children without affecting the original Prefab, you can use them in Unity without breaking the link to the file, and bring in updates.
+* [FBX Prefab Variants](prefabs.md): The FBX Importer allows you to import an FBX file as a **Model Prefab** and create **Prefab Variants** from them. Since Prefab Variants can override properties and children without affecting the original Prefab, you can use them in Unity without breaking the link to the file, and bring in updates.
 
 * [Unity Integration for 3D modeling software](integration.md): Effortlessly import and export Assets between Unity and Autodesk® Maya®, Autodesk® Maya LT™, or Autodesk® 3ds Max®. The 3D modeling software remembers where the files go, and what objects to export back to Unity.
 

com.unity.formats.fbx/Documentation~/images/FBXExporter_MayaExportSetAttributes_Updated.png

@@ -165,7 +165,7 @@ on the set. In order to do so, select the set, go to the Attribute Editor, and m
 
 > **NOTE:** If Arnold is installed, the attributes may appear in the Attribute Editor under __Arnold__ > __Extra Attributes__
 
-![](images/FBXExporter_MayaExportSetAttributes_Updated.png)
+![](images/FBXExporter_MayaExportSetAttributes.PNG)
 
 | Property:                     | Function:                                                    |
 | :---------------------------- | :----------------------------------------------------------- |

com.unity.formats.fbx/Documentation~/index.md

@@ -1,11 +1,11 @@
 {
   "name": "com.unity.formats.fbx",
   "displayName": "FBX Exporter",
-  "version": "3.2.0-preview.2",
+  "version": "3.2.1-preview.1",
   "dependencies": {
     "com.unity.recorder": "2.2.0-preview.4",
     "com.unity.timeline": "1.0.0",
-    "com.autodesk.fbx": "3.0.1-preview.1"
+    "com.autodesk.fbx": "3.1.0-preview.2"
   },
   "unity": "2018.3",
   "unityRelease": "4f1",