Based on very valuable customer feedback, we improved the workflow for exporting / printing presentations so the user can interact with iFrames in the presentation and fine-tune their content before exporting.
Other than that, this release is identical to 3.18.0.
See the official 3.18.0. release notes to get more information and a general idea and head over to Legacy: Print Menu to PDF to learn more about the print / export workflow.
Happy presenting!