What does dragging the playhead to a desired frame in a clip allow you to change?

Dragging the playhead to a desired frame in a clip allows you to change the thumbnail image for the clip. This action is a common editing technique in video editing software; by positioning the playhead on a specific frame, you can select that frame as the representative image for the clip within the media bin or timeline. This is particularly useful for visually identifying clips, especially when working with a large number of them, as the thumbnail serves as a quick reference to what the clip contains.

In contrast, adjusting the audio level, applying video effects, or altering the duration of the clip requires different actions or settings within the editing software. Those processes involve methods like keyframing audio levels, accessing the effects panel to apply filters or transitions, or trimming the clip to change its length, none of which are accomplished simply by dragging the playhead.