When using a Potion of Healing on yourself, you can choose to use it as an action, providing maximum HP recovery, or as a bonus action, which requires you to roll. When using a potion of healing on another, you can use either action or bonus action, but you must always roll.

Scrolls can be used by any one by using a Magic Action, however you must succeed on an Arcana Check, the DC being 10+Spell Level on the scroll. on a failure, the scroll is not lost but the scroll is unable to be used until your next long rest.