How to change display order of pictures and objects?

I have imported pdf via insert>object and an image via insert>picture. I need them to overlap with the pdf on the bottom and the image on top. The pdf defaults to the top and I cannot seem to change this order. Is ther any way to get the image to display on top if the pdf?

Oder of import, and right  click>send to back (on the pdf object) does not work.

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