# Generation References Source: [Generation References]() Documentation index: [llms.txt]() Last updated: 2026-08-24 A generation reference guides the result; it is not automatically inserted into the edit. Put each reference in the slot used by the selected model or attach it to the Agent message, then explain what it should control. ## Choose the reference path - **Agent request:** select **+** for local files, or use **Selection Mode** to add `@` references to assets, clips, time, Viewer regions, or Transcript text. - **Video Gen:** open **Video settings → Input** and use the visible **First Frame**, **Last Frame**, **References**, **Image Ref**, source-video, edit, or extend slots. - **Existing project media:** drag or select it from **My Assets** rather than uploading a duplicate when the slot supports project assets. ## Describe the job of each reference State whether a file controls identity, wardrobe, product shape, composition, motion, camera, color, timing, audio rhythm, or only general style. Also state what may change. A reference without a role can be interpreted differently from what you intended. ## When inputs disappear Reference types and limits belong to the selected model and mode. Switching models or changing from Generate to Edit/Extend can remove incompatible inputs. Recheck every slot, duration, resolution, and credit estimate before sending. For exact video limits, see [Model Capability Matrix](https://pr-444-preview.chatcut.dev/docs/model-capability-matrix). For persistent project media, see [My Assets — What is the difference between a Prompt attachment and project media?](https://pr-444-preview.chatcut.dev/docs/my-assets#what-is-the-difference-between-a-prompt-attachment-and-project-media).