If you choose to explore this route (at your own risk):

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Research Thoroughly: Look for apps with a large number of positive reviews and a clear privacy policy.
Grant Minimal Permissions: Only grant the app the necessary permissions to perform the backup/export function.
Test Carefully: Start by exporting a small chat history to see if the app works as expected and produces the desired output format.
We strongly advise against using untrusted third-party apps for this purpose due to the inherent risks.

Method 3: Accessing and Exporting via Telegram Desktop (Recommended for Comprehensive History)

The most reliable and comprehensive way for Android users in Bangladesh to export their Telegram history is by using the Telegram Desktop application on a computer.

Steps:

Install Telegram Desktop: Download and install netherlands telegram phone number list Telegram Desktop on your computer (Windows, macOS, or Linux) from the official Telegram website
Log In: Launch the application and log in to your Telegram account using your phone number or QR code.
Select the Chat(s): Open the specific private chat, group, or channel you want to export.
Access Export Options:
For individual chats: Click the three dots (⋮) in the top-right corner of the chat window and select "Export chat history".
For exporting multiple chats or all data: Click the three horizontal lines (≡) in the top-left corner, go to "Settings" > "Advanced" > "Export Telegram data".
Configure Export Settings: In the export window:
Choose the data you want to export (messages, media, etc.).
Select the format: "Human-readable HTML" is generally recommended for easy viewing.
Choose a download path.
Click "Export": Once the export is complete, you can find the exported files on your computer. You can then transfer these files to your Android phone if needed.
Conclusion for Android Users in Bangladesh:

While direct, comprehensive Telegram history export isn't currently available on the official Android app, the most reliable method for users in Bangladesh is to utilize the Telegram Desktop application on a computer. This allows for a full export of your chats in a readable format. Be extremely cautious when considering third-party Android apps that claim this functionality due to potential security and privacy risks. Saving individual messages and media directly on your phone is suitable for small amounts of content. Remember to prioritize the security of your Telegram account and personal data.