Myles Smith appears on ABC’s ‘American Idol’ (Disney/Christopher Willard)Some artists cancel shows hours before they’re set to take the stage, but Myles Smith has canceled one of his performances a week in advance. In a lengthy Instagram Story message, Myles explains why he’s scrapped his Aug. 4 show in Vancouver. “There has been a major family health issue at home, and important appointments are taking place on that date,” he writes. He also says he’s “truly sorry” and he understands the “frustration and disappointment” he’s seen online from fans. “I’m not asking anybody to feel sorry for me!