1, see the picture below. I can't see the picture in page view, just a line.

But in outline view can be seen.

2, the reason for analysis: the document inserted in the picture layout default "embedded", and this paragraph is set to a fixed line spacing, line spacing limits the display of the picture.

3, the solution: the line spacing is set to a non-fixed value, such as "minimum", the line spacing can be adjusted with the size of the object, you can see the picture.