If you already have floorplan created in SweetHome3D app, it is possible to transfer/upload it to Klet3D app.
1. Open Klet3D app
2. Create new floorplan
3. Save new empty floorplan
4. In left panel scroll to bottom to section “Upload .sh3d file”
5. Select your SweetHome3D file on computer
6. Follow steps to finish setup 🙂