Layers are lost when saving as PDF
When saving a single page document from InDesign as a PDF all layer information is lost.

All the layers exist but are jumbled up in one layer and unnamed in a clip group. Why is this?
I then have to rebuild thus:

I then have to rebuild the layer sequence order in Illustrator for subsequent delivery to AfterEffects and Premiere. It is important to do this as the latest updates of Premiere Pro, After Effects and Media Encoder don't support PNG files
