How do I add an anchor point to an existing vector shape in Figma? Is this possible, like in sketch? Is there a keyboard shortcut?
Of course thats possible:
Make sure you have nothing selected on the canvas and the selected tool is the Move-tool (Shortcut: V).
Make a double click on the existing vector shape to get into the vector editor mode.
Select the Pen-tool from the toolbar (Shortcut: P).
Hover over the path of the vector shape where you want to add the anchor point, until a little
+sign appears next to the cursor.
Then click on the path to add the new anchor point.
Press ESC to abort the drawing of a line from the newly added anchor point.
You can now switch back to the Move-tool (V) to select and transform the anchor point.
For better understanding I made a short screencast of the actions: