Is a frame where a new symbol instance appears in the timeline?

Yes, a frame in animation or video refers to a specific moment in the timeline where a new symbol instance can appear. This can signify the introduction of a character, object, or event within that specific duration. Each frame contributes to the overall sequence, helping to convey movement and progression in the timeline. Thus, the appearance of a new symbol instance in a frame is essential for storytelling and visual continuity.