My team is able to use the ejs-pdfviewer to make a custom stamp using a png image and add it to the pdf. we then save the document to our blob storage without flattening. if we open up this document in a pdf viewer all stamps remain. if we open the document in the angular ejs-pdfviewer the only stamps that are missing are the ones that are png based.
attached is a zip with a pdf that has a stamp that disappears in the pdfviewer
VVVisvesvar Venkatesan Syncfusion Team December 5, 2022 01:08 PM UTC
The given PDF document opens properly similar to Adobe
reader. We have verified this in our latest version 20.3.59. If you are using a
older version, Kindly upgrade your version and let us know if the issue is
resolved or not.
Kindly find the screenshot of the given document loaded into
the latest version of Angular PDF Viewer.