Flattening annotations doesn't work as intended

[PAIN JOHNNY]

hi everyone,

I'm trying to flatten pdf files which contain annotations :

for this I've tried to use SyncFusion's embedded function, which seems easy enough :

public void flattenPdfFileSyncFusion(string path)
        {
            //Load the existing PDF document
            PdfLoadedDocument loadedDocument = new PdfLoadedDocument(path);
            //Get all the pages
            foreach (PdfLoadedPage loadedPage in loadedDocument.Pages)
            {
                //Flatten all the annotations in the page
                loadedPage.Annotations.Flatten = true;


            }
            //Save and close the PDF document instance
            loadedDocument.Save(path);
            loadedDocument.Close(true);
        }

but the results are pretty strange, and the best outcome I could get (depending on source file) is this :

sometimes the annotations completely disappear too (maybe it depends on the original file generated from PDFCreator or WonderShare).

is it a common issue ?

and most importantly, is there any workaround to this ?

thank you

[Gowthamraj Kumar]

Hi PAIN, 

Thank you for contacting Syncfusion support.

We have tried to reproduce the reported issue with our test documents in our end, but it is flatten properly. We suspect that the issue may occurs with the specific input document. We have attached the sample with output document for your reference, please try the sample on your end and let us know the result. 

Sample: https://www.syncfusion.com/downloads/support/forum/168899/ze/FlattenSample-1677758950

 

UG: https://help.syncfusion.com/file-formats/pdf/working-with-annotations#flatten-annotation

 

We request you to share the input document, modified sample, product version to reproduce the issue in our end. So that it will be helpful for us to analyze and assist you further on this.

Regards, 

Gowthamraj K