Microneedle patch a painless way to deliver vaccines

The video explains the use of a microneedle patch for vaccine delivery. The patch contains hundreds of microscopic needles that penetrate the skin to a depth of half a millimeter, which is sufficient to deliver the vaccine without causing pain. The vaccine is embedded in a film that dissolves over days or weeks, gradually releasing the vaccine into the body.

What happens to the film once it is inside the skin?

Explain the process of vaccine release from the film.