Marker not transparent after export as PDF

[Spartinix]

Hey guys, 
so I have this problem, where I can't save my Notes as PDFin a useful way.

When I Safe them as PDF, all the semi-transparent markers are not transparent anymore, so I can't read what I marked.

It also happens when I save them as Word documents, but it works fine when I export them as images.

It doesn't matter if I try this on my tablet(Tab S6 lite) or my Pc. 

I hope you can help me ^^.

Thanks in advance.

[Sean03]

what program are you using to open the PDF documents once you saved them?

[Spartinix]

I have tried it with: Adobe Acrobat Reader DC, Google Chrome, Foxit Reader  and it's always the same.

[Sean03]

I'll try opening my saved PDF files in one of those programs on my desktop later when I can. The thing is I open my PDF files in Samsung Notes to read them even after I've saved them. And the transparency is saved. Maybe try using Samsung Notes as your reader on your tablet for now, the transparency should be preserved and not flattened, even though that doesn't solve your problem completely. Hopefully someone else who's solved this problem before will answer.