include picture into text frame?

Hello!

I am preparing an orchestral score. In the beginning I created a text frame (on page one, before the music notation starts) that includes the instrumentation. Among the instruments are 4 timbales. The composer gave the exact timbales to use and penned down a short snippet of barlines and noteheads.
I created such a picture through musescore and made a "screenshot" (to get a png-file). I then tried to include the picture, but it has to be connected to a specific measure. I then just connected it to the first measure and moved it in the text frame (so on another page, one page before). Everything looks good on screen, but when I create a pdf-file the picture is not visible (is it maybe "below" the text frame?).
I then tried different modifications and noticed that the picture remains visible in the pdf-file when it stays on the same page as the measure it is connected to. But when I move it to a different page it disappears. I created a "test-score" to show the problem (see below). It contains two pages: First page with text frame and moved picture and a second page with measures and againa picture. Both are visible on screen, but only the second one in the pdf-file

Does anyone has a solution for this?