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

Name: Vulcano_Flexform_Outdoor_Sofa_1
Version: 2013
Preview: Yes
Units: Millimeters
Dimension: 2826.61 x 2832.96 x 820.19
Polys: 1,007,173 (without TurboSmooth)
XForm: Yes
Box Trick: Yes
Model Parts: 62
Render: Corona
Formats: 3Ds Max 2013, FBX