When you open an InDesign page via the Plug-In, the latest saved Advertising Layer Layout is always uploaded with the document, even if this overlays page document content that was already present before the advertising layer layout change.

The Advertising Layer is locked and the default colour for advert blocks to display is magenta. The default colour can be altered by editing the config element ColourForMissingAdverts parameter in the InDesignConfig.xml file:

<InDesignConfig 

  LinkPing="10000" 

  ArchivePDFVariantName="PDF_[Press quality]" 

  PrintPDFName="[Press quality]" 

  PageCompleteWorkstate="Page Closed" 

  PrintQueueName="PDF file" 

  PrintSinglePages="false" 

  port="5679" 

  ColourForMissingAdverts="16711935" 

/>

The number following the parameter is the RGB colour code as an integer and not hexadecimal.