Imported Fusion360 assembly looks broken

[ghost]

• Add-On Version: 1.3
• FreeCAD Version: 0.19.x / RealThunder's 07.17 LinkDaily ( FreeCAD-asm3-Daily-Conda-Py3-Qt5-20210717-glibc2.12-x86_64.AppImage) - https://github.com/realthunder/FreeCAD_assembly3/releases/tag/0.11
• File(s): tiny_thinkpad.f3d - https://github.com/PaulKlinger/tinypc/blob/master/ThinkTiny/3d%20models/tiny_thinkpad.f3d

Actual Behavior

After import Fusion360 file its look not good:

• "nativ" strategy: fully broken parts solid geometry, broken assembly & with a lot of garbage/artifacts;
• "Convert to STEP" strategy: parts imported with almost correct solid geometry, BUT assembly looks broken & with a lot of garbage/artifact

Expected Behavior

Imported solid parts & assembly should look correct without any artifacts.

Additionally, as during initial import there is shown bundled PNG preview (which generated by Fusion360 during original file saving) there should be note in "choose strategy" screen:

Import Autodesk-File based:
* on ACIS (SAT), or base
* on feature model (nativ)?

NOTE: Thumbnail you see
is bundled preview image
generated by file creator.

[jmplonka]

Thank you for the detailed Bug-Report. THUMP-UP The note for the import-Message is very useful and will be available in the next update. I'm not optimistic with the assemblies, if they can be placed correctly. Let's see, if I can figure out the root cause.