Is it possible to trigger the save function from outside the frame? I have some UX issues with many other buttons for other usecase-specific functionalities, and not having the save button among them is somewhat confusing to the user.
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Yes... sort of... I have an example at this CodePen.
The idea is with every change to the PDF, you create the object to be saved using the Embed API. Your button then executes the save action. In my example, it creates a data URL so you can download the file but you can do whatever you need.