If possible, the TurboSmooth modifier is left in the 3Ds Max 2013 file.
Export file without using TurboSmooth.
https://www.flexform.it/en/outdoor/products/sofas-sectional-sofa-ottomans/vulcano 

Name: Vulcano_Flexform_Outdoor_Sofa_4
Version: 2013
Preview: Yes
Units: Millimeters
Dimension: 2758.65 x 3298.05 x 853.77
Polys: 603 940
XForm: Yes
Box Trick: Yes
Model Parts: 38
Render: Corona
Formats: 3Ds Max 2013, FBX