I have spellbooks. I have unlocked spells via Weave. I have recruited wizards. I've chosen scrolls for my hero. Despite this, I cannot find a way to cast a spell (besides making the standard ranged attack). I have seen what seems like a potential error, as my spellbooks aren't listed as being used in the strategic resource menu. Also, there's no spellbook button beneath the "delete unit" button (which is how I've seen people demonstrating casting spells in old youtube videos). Am I missing something?