> ## Documentation Index > Fetch the complete documentation index at: https://docs.sprello.ai/llms.txt > Use this file to discover all available pages before exploring further. # Connections and data types > How images, video, and text flow between nodes, and what can connect to what. Edges carry data from one node to another. Every connection has a **type**—image, video, or text—and Sprello only allows connections that make sense. This keeps your workflow valid as you build. ## What connects to what | Data type | Produced by | Accepted by | | --------- | --------------------------- | --------------------------------------------------------------------------------------------- | | **Image** | Image Input, Generate Image | Generate Image (as reference), Generate Video (as source frame), Generate Text (as reference) | | **Text** | Text Input, Generate Text | Generate Image, Generate Video, Generate Text (as the prompt) | | **Video** | Video Input, Generate Video | Video Input (to feed another video) | A few connections aren't allowed, because the model can't use them—for example, a video output can't feed an image generator's reference slot. Sprello blocks these as you draw them. ## Connections fill in prompts and references When you connect a node into a generator, Sprello wires it in automatically: * **Text → a generator** adds a reference badge like `@Product description` to the prompt. The generator resolves it to the real text when it runs. * **Image → a generator's reference slot** adds the image as a reference. (Generate Image and Generate Text accept reference images; Generate Video uses an image as a source frame.) You can mix typed text and references freely in a prompt: write your own wording around the `@` badges. A Text Input connected to a Generate Image node, shown as a reference badge in the prompt ## Connection limits * A generator's **reference image** slot has a maximum that depends on the model—some accept a few references, others many. Sprello checks capacity before allowing a new connection. * Single-value slots accept one connection. ## Edges are the source of truth A reference only means something if there's an edge behind it. Remove the connection and Sprello cleans the matching `@` reference out of the prompt for you—so prompts never point at nodes that aren't wired in. ## Next Each vs All: one result per item, or all combined. Pair two sets of inputs together.