Images and Documents
Use the + button in the message input to attach an image or document to the next message.
Images
Images require a selected provider/model that advertises image input. Biyan blocks the send if the selected model lacks that capability; it does not download or substitute a local vision model.
Documents
Biyan uses one of two explicit paths:
- Native file input: when the selected provider/model supports the file type, Biyan sends the file through that provider's native file interface.
- Local text extraction: otherwise Biyan extracts the complete readable text on the device and includes that text in the provider request.
The local parser supports the product's listed PDF, text, source-code, CSV, spreadsheet, presentation, HTML, and DOCX formats. Scanned or image-only PDFs require provider-native support because local OCR is not provided.
Limits
- Maximum file size: 20 MB per file.
- The complete extracted text must fit within the selected model/provider context budget together with the conversation and instructions.
- When either limit is exceeded, Biyan blocks the send and explains the constraint.
- Biyan does not silently truncate or automatically summarize a document.
Native files, extracted text, images, prompts, and relevant conversation context are sent to the selected cloud provider. Review that provider's retention and data-use policy before sending sensitive material.
Projects organize chats and files, but do not create a knowledge base or RAG/vector index. See Projects.