If you have Acrobat, open the PDF in it and go to "Tools - Print production - Set page Boxes". There, select the TrimBox (that is: The final size of the trimmed finished page) and then the BleedBox (the final page before trimming the bleed). The difference between them should give you the value of the bleed (3 mm. is the most common one). If both boxes have the same value, you've got no bleed whatsoever in that PDF. In InDesign, make sure that in "File - Document setup - (More options - Bleed and Slug)", you have defined the proper value for the bleed. Afterwards, you should see the bleed in InDesign in "View - Screen mode - Bleed". After everything and all the elements are is properly bleeded..., you just make the PDF by exporting ("File export as print PDF", not "Interactive PDF"), There, in the "Marks and bleed marks", choose the "Use document settings" option. Now, when examining the new PDF in Acrobat, you should see a difference between the BleedBox and the trimBox. And, please, use a PDF/X preset when exporting. Best regards
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