The access to Poliigion website:
https://www.poliigon.com/
How different channels represents material texture properties in keyshot
1. For non-metal materials
Diffuse -> COL_VAR
Highlight -> REFL
Bump -> NRM -> -1
Roughness -> GLOSS
2. For metal meterials
Diffuse -> COL_VAR
Highlight -> REFL
Bump -> NRM -> -1
Roughness -> GLOSS