Overprint pdf export not working

[Thomas Serafini]

I have created a Global colour with the Overprint and Spot option enabled.

When I export the document in pdf, the overprint option is not saved. In fact if I open back the pdf in Affinity Designer, there is no overprint option in that colour.

Can someone help me? I'm attaching the original file.

 

overprint test.afdesign

 

[lacerto]

Obsolete.

[Thomas Serafini]

Thank you so much, this information has been very useful!