How to create a button in top toolbar in mobile?

Hi PDFTron,
I wanna create a button on top toolbar in mobile. How to make it in React Native language?
Thank you!

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Thanks for contacting us. Could you give us a high level use case of what you’re trying to achieve here? What kind of buttons are you trying to add here and what functionality does it provide?


Hi Andrew,
I just wanna create a button next to vertical 3 dots icon. When click the button, the document will be saved on my server. I use React Native language.
Can you give me the solution how to make it?
Thank you!