I recently tested SimScale with OnShape, i.e. cloud FEM with cloud CAD. On the FEM side there was a button "import from OnShape", which opened popup that did go

I recently tested SimScale with OnShape, i.e. cloud FEM with cloud CAD. On the FEM side there was a button "import from OnShape", which opened popup that did go through authz flow ("do you want to allow SimScale to access your OnShape content") and then proceeded to show a part/assembly selection dialog. Reasonably smooth process considering that they are two completely separate companies etc.