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Can't delete sub-assemblies or parts in an imported STEP assembly

Hello,
I imported an assembly I designed with another CAD to oneshape, with a hundred parts or so.
I tried every option (import to a single document and split into multiple documents) but I land anyway in a situation where I can't delete sub-assemblies or parts in the instances list.
The options is simply not in the contextual menu.
Assy is the main assembly, I can delete Payload <1> and its "brothers" but nothing below them.
Thanks
0
Comments
Click where it says "open linked document". Once there, you can delete any parts not needed. Make a version in that document. Return to this document, and update to the latest version to show the change.