Importing Moi 3D OBJ quad meshes

I am currently using a workflow which is SolidWorks > STEP > Moi3D > OBJ
The quad meshes are really good, however when I apply a subdivision modifier the seams break apart and go funny like this:

Is there any easy way to fix this?

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dude you have to go to edit mode and select the mesh and then merge by distance with the threshold as needed to remove and weld any loose edges/vertices…

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I used Mesh>Merge>By Distance and it worked. Thanks.

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