Should I apply hyaluronic acid to wet or dry skin?

Specialist-community consensus on r/SkincareAddiction is to apply HA to damp skin and then seal it with a moisturizer. HA is a humectant, so in low-humidity environments applied to dry skin it can pull moisture out of the skin rather than into it. A moisturizer or occlusive on top is repeatedly called the non-negotiable step.