First, turn on AssistiveTouch (Settings | Accessibility | Assistive Touch), and turn on the Dwell Control setting (near the bottom of the Assistive Touch page).
The video illustrates how to use dwell selection to make a simple drawing. For each drag action, first select the Hold and Drag action from the AssistiveTouch menu. Then, to start a drag, make a dwell selection at the drag starting point. Then move the mouse to accomplish your drag. To end the drag, make a dwell selection at the drag end point.
The new Hold and Drag action makes it possible to do a drag action without using a physical button at all.
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