Dear athomp365,
Thanks for your information.
After testing with the latest
Spire.Doc Pack(hot fix) Version:6.5.10, the watermark could be added successfully. I attached the result file for checking. Besides, I also tested the case with free version, there indeed was the issue that the watermark didn't save, so sorry for this.
Please use the latest version and try again. Below are the dlls in it:
Spire.Licesne.dll V1.3.6.40
Spire.Doc.dll V6.5.10.4040
Spire.Pdf.dll V4.5.3.2040
Sincerely,
Betsy
E-iceblue support team
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