I have a Surface Pro 6, and I find it more comfortable to draw and paint when in tablet mode, which means there is no keyboard attached.
When using Clip Studio Paint Pro, and with the keyboard attached, I can press the Shift key when using the Auto Select tool, and that will add the new selection area while keeping what I've already selected.
When I'm in tablet mode, though, with no keyboard and no shift key, there doesn't seem to be any obvious way to add to a selection. I can only select new areas and lose my current selection.
Can I add and subtract from selection areas using the Auto Select took without a keyboard?
Is there any resource that explains in general options for using Clip Studio Paint without a keyboard?