Note: Avoid importing the OBJ file into Unity as it will cause the model to crash.
Thus, we have devised a general process of exporting the model.
Ensure the materials in the models are applied accordingly
Export the model as an FBX file. FBX retains the mapping properties of the textures but not the textures themselves.
To circumvent this issue, export the model as an obj into a separate folder to get all of the used textures in one place.
Import the textures from the OBJ folder into Unity.
Import the FBX file into Unity.
Select Parent Component of the model, and right click > Unpack Pre Fab Completely.