I am experiencing the same problem.
I found a release note from some time back that indicates that was a bug in the past:
Setting page zoom factor disappears page contents
at this link:
Is this a re-occurrence of an old bug. Can you research and let us know your findings?
I have attached a zip file that contains the input pdf and the resulting output after zoom.
Thanks for contacting support and sharing file(s).
I have tried to set the zoom factor by following code snippet and the content of the file did not disappear in the output file. I have also attached the generated output for your reference.
Aspose.Pdf.Rectangle rect = pdfDocument.Pages.Rect;
Facades.PdfPageEditor ppe = new Facades.PdfPageEditor();
ppe.Zoom = 0.5f;
ppe.PageSize = new Aspose.Pdf.PageSize((float)rect.Height, (float)rect.Width);
However I have observed that setting the page zoom factor did not take any effect in the output file. For which I have logged the issue as PDFNET-42351 in our issue tracking system. We will further investigate the issue and keep you updated on the status of its resolution. Please be patient and spare us a little time.
We are sorry for the inconvenience.
Thanks for that info.
fosteral:What version of aspose.pdf were you using?