You cannot attach an image to a vector store. It is text-based embeddings search.
You can however use a new Assistants method for passing image attachments along with a user message “content” when creating the message:
I made a screenshot so you don’t have to click “expand” several times.
gpt-4-turbo must be used, and you’ll probably want to include some assistant instructions that say that the AI can use its built-in computer vision.
Chat Completions has a different message format for passing images.