Using an Android Tablet
Note: Use Firefox or Chrome. Your vendor’s device (e.g., Samsung Internet) may not be compatible with BigBlueButton (which officially recommends the two mentioned browsers, anyway).
Variant 1: Use the Whiteboard of BigBlueButton
This seems to be the easiest solution; however, antialiasing seems to be rather poor and there might be some delays. While this is not an issue when simply annotating PDFs, it might be inconvenient for writing longer texts.
This method may be feasible in an exam-like setting, but note that there is no possibility of exporting the annotated slides out of BigBlueButton. If there is a recording of the session, you can skip through the video and make screenshots of the annotated slides. Otherwise you need to do that before ending the conference, or else your annotations are lost.
Variant 2: Mirror the Screen of your Android Device to your Computer and Share the Computer Screen
You might want to try
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TeamViewer on your computer and the corresponding TeamViewer QuickSupport on your android device. However, as of September 2019, the Linux TeamViewer client does not support mobile devices.
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Vysor (Windows, Linux, macOS) shares your Android device via USB debugging.