Thank you @Smithy. Being a good Italian boy (whose family is from Orvieto) I will attempt a response. It will be in English as my Italian is so rusty as to be useless. I can't even swear correctly anymore.
@Benny63 I know the preview is nice to have, but it isn't a necessary feature. When you received the printer - was a slicer program included as part of the package? I will guess that one was and that it is a Two Trees version of a slicer (possibly Cura) and not the Ultimaker version. You would need to go back to "Due Alberi" and maybe they can tell you what changes to make in the Ultimaker version so the preview is generated for your display.
I have moved your posting to the Italien section, otherwise no one can help you when you don't write in English.
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