Hello,
As Sketchup is not our product it is difficult to provide accurate instructions.
It is also important to note that it is Sketchup that is determining the output of the item and not 2020.
As far as importing Sketchup items into 2020, nothing has changed with the exception of the models we can import and support.
I do not believe that the items will behave any differently in a previous version of 2020.
Hope this helps.