PDF watermark - .net core and react

[88nothing]

Please give a brief summary of your issue:
PDF Watermark, on off

Please describe your issue and provide steps to reproduce it:
after upload pdf to client(react) and use pdftron web viewer to modify to modify the watermark, the pdf need to be saved on my system again.
if i would like to remove\change the watermark(.net core), how to do that?
is it possible to attach watermark to multiple documents from server only without using pdftron web viewer? if so how to do that?

[system]

Hello, I’m Ron, an automated tech support bot

While you wait for one of our customer support representatives to get back to you, please check out some of these documentation pages:

Guides:

• APIs to convert files to PDF on Cross-Platform (Core)
• APIs to edit PDFs on Cross-Platform (Core)
• APIs to redact PDF content on Cross-Platform (Core)
• API for digital signatures on Cross-Platform (Core)

APIs:

• AnnotsCompat.Watermark - public static long Create (long doc, long pos)
• Class HTML2PDF.WebPageSettings
• Watermark - public Watermark (Annot annot)

Forums:

• Sample code to watermark existing pdf in asp.net web application
• How do I remove a watermark from an existing PDF document?
• Add a Text Watermark using Stamper on UWP

[Ryan]

is it possible to attach watermark to multiple documents from server only without using pdftron web viewer

Yes, definitely, see the Stamper sample.

PDFTron

As for the rest of your questions, I am not quite clear what you are asking.

The best way to proceed is to provide the following information.

1. Input file(s)
2. Generated output file(s)
3. Code and settings used to generate (2) from (1)
4. Screenshots showing the output, and clearly indicating what you expected to get instead, and also clearly indicating the application/browser being used to view.