How do you select multiple layers in tablet mode?

[bzzzcat]

I'm using Photoshop CC on my Surface Book in tablet mode.  I want to select multiple layers to link together but I haven't found a way to do this with just the tablet and pen (or my finger).  Can anyone help?

[JJMack]

Use the touch shift key in the modifier keys panel set in preferences show on screen via menu Windows>Mofifier Keys.

[JRfromPTC]

Here's a screenshot of what that looks like.