Problem solved !
Model imported into S3D, repositioned correctly relative to the bed surface, then exported again. Copying the exported .STL file into the user profile.
Is this option the one allowing you to place an 'image' of the printer as a 'background' of the screen, as on the old version where this was done through the options.
If so, I don't see how to proceed. Can you tell me how to proceed?
Thank's