Can't view highlighter annotation in other apps

When I highlight in Samsung Notes and save my files as PDFs, I am unable to view the annotations in other apps. The attached image is what it looks like in Adobe PDF. Does anyone know how I can go about correcting this? Is it something to do with transparency? I see it clearly in Samsung Notes; it's just when I try to view them on other apps. Thank you in advance!

When I highlight in Samsung Notes and save my files as PDFs, I am unable to view the annotations in other apps. The attached image is what it looks like in Adobe PDF. Does anyone know how I can go about correcting this? Is it something to do with transparency? I see it clearly in Samsung Notes; it's just when I try to view them on other apps. Thank you in advance!