can't edit imported pdf?

imported the pdf and opened it but  it is not editable.  when I first imported it told me there would be font substitutions which is fine so corel  was reading the components of the pdf ok if it knows what kind of fonts are in there. but when I opened it could not edit anything, not text, not images, nothing. how to get it be a real editable pdf? btw I tried open in curves and text, no difference. thanks!

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