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Build a Retrieval-Based Chatbot with Telegram, OpenAI and Google Drive PDF Backup

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Created by: Trung Tran || trungtran

Trung Tran

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Last update 23 days ago

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📚 Telegram RAG Chatbot with PDF Document & Google Drive Backup

  • An upgraded Retrieval-Augmented Generation (RAG) chatbot built in n8n that lets users ask questions via Telegram and receive accurate answers from uploaded PDFs. It embeds documents using OpenAI and backs them up to Google Drive.

👤 Who’s it for

Perfect for:

  • Knowledge workers who want instant access to private documents
  • Support teams needing searchable SOPs and guides
  • Educators enabling course material Q&A for students
  • Individuals automating personal document search + cloud backup

⚙️ How it works / What it does

💬 Telegram Chat Handling

  1. User sends a message
    Triggered by the Telegram bot, the workflow checks if the message is text.

  2. Text message → OpenAI RAG Agent
    If the message is text, it's passed to a GPT-powered document agent.
    This agent:

    • Retrieves relevant info from embedded documents using semantic search
    • Returns a context-aware answer to the user

  3. Send answer back
    The bot sends the generated response back to the Telegram user.

  4. Non-text input fallback
    If the message is not text, the bot replies with a polite unsupported message.

📄 PDF Upload and Embedding

  1. User uploads PDFs manually
    A manual trigger starts the embedding flow.

  2. Default Data Loader
    Reads and chunks the PDF(s) into text segments.

  3. Insert to Vector Store (Embedding)
    Text chunks are embedded using OpenAI and saved for retrieval.

  4. Backup to Google Drive
    The original PDF is uploaded to Google Drive for safekeeping.

🛠️ How to set up

  1. Telegram Bot

    • Create via BotFather
    • Connect it to the Telegram Trigger node

  2. OpenAI

    • Use your OpenAI API key
    • Connect the Embeddings and Chat Model nodes (GPT-3.5/4)
    • Ensure both embedding and querying use the same Embedding node

  3. Google Drive

    • Set up credentials in n8n for your Google account
    • Connect the “Backup to Google Drive” node

  4. PDF Ingestion

    • Use the “Upload your PDF here” trigger
    • Connect it to the loader, embedder, and backup flow

✅ Requirements

  • Telegram bot token
  • OpenAI API key (GPT + Embeddings)
  • n8n instance (self-hosted or cloud)
  • Google Drive integration
  • PDF files to upload

🧩 How to customize the workflow

Feature How to Customize
Auto-ingest from folders Add Google Drive/Dropbox watchers for new PDFs
Add file upload via Telegram Extend Telegram bot to receive PDFs and run the embedding flow
Track user questions Log Telegram usernames and questions to a database
Summarize documents Add summarization step on upload
Add Markdown or HTML support Format replies for better Telegram rendering

Built with 💬 Telegram + 📄 PDF + 🧠 OpenAI Embeddings + ☁️ Google Drive + ⚡ n8n