Unfortunately, we do not support adding an annotation to an OCG layer yet.
You can find some examples related to OCG features in the Optional Content Groups (Layers) section in our Reference Guide, for example:
http://guides.gdpicture.com/content/web ... ewOCG.html
Could you please attach your PDF document so we can probably make a quick analysis of what we can do about it?
You can also open a ticket on our support platform https://orpalis.zendesk.com and describe your workflow there so we can provide investigations.
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