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Thanks Johannes_B for the hint, but I'm sure that my pdf has many pages. Also I tried to use different pdf.

Hi everyone,
I'm new here and I hope to write my problem in the right place, following rules of the forum.
My main problem happen when I try to import a pdf file in Lyx because it import only the first page of the pdf whatever I do.
I'm using this procedure:
Insert --> File --> External material ...