iPads & Incompatibility with AutoCAD and OneDrive

ShetchUp mobile on Apple iPads when AutoCAD DWGs are stored in OneDrive is incompatible - SketchUp is automatically associated to DWGs.
Same AutoCAD drawings in Dropbox maintain their associations with AutoCAD App.
Besides the workaround whereby you must select “Open in another App” for the file and manually open with AutoCAD each and every time you want to open another DWG, how do you permanently associate the DWG with AutoCAD?

By the way, deleting the SketchUp app does not reset the association to AutoCAD.