A slide image cannot show the speaker's sequence
Presentations can build a chart gradually or reveal lines one at a time. JPG records one static view, so choose a slide state that communicates the main point without the animation. A frame with only the first bullet may be confusing to someone who never saw the talk.
Narration, transitions, and speaker notes are outside the image. If the deck is a training resource, provide a written explanation or the approved presentation itself. A JPG set is useful for static previews and galleries, not as a complete replacement for a live slide experience.