OnShape - Assemblies aren't assembled

I’m having a problem with OnShape that when I import an assembled part, they aren’t mated together. How can I fix this other than having to manually assemble an omni wheel?

Don’t worry, this is a feature of OnShape and is supposed to happen. All you have to do is group together the parts. After this, you can constrain the groups of parts together.

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Yep. Not just Onshape, but all parametric CAD: it’s because .step files contain only geometry data, but not mate data.

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