# Audio File Display Name Fix - Complete

## Problem Solved
User wanted audio files to show proper "Artist - Title.mp3" names when sent to Telegram, but without changing the saved filename on disk.

## Solution Implemented
1. **Reverted file storage**: Files are saved with original format `${videoId}_${title}.mp3` 
2. **Custom display filename**: Added logic to generate custom filename only for Telegram display
3. **Modified sendAudioFileInternal()**: Now accepts both URLs and file paths, generates custom filename for display

## Key Changes in src/bot.ts
- Function now detects if input is URL or file path
- Extracts local file path from URL when needed  
- Generates custom display filename: `${performer} - ${title}.mp3`
- Uses file options parameter to set custom filename in Telegram
- Maintains backward compatibility with both URL and file path inputs

## Technical Details
- Uses node-telegram-bot-api file options: `{ filename: customFilename, contentType: 'audio/mpeg' }`
- Sanitizes performer and title for safe filename (removes special chars, limits length)
- Fallback: sends as document if audio fails
- Error handling: sends text message with link if all methods fail

## Result
- Files stored on disk: `123456_song_title.mp3` (unchanged)
- Files displayed in Telegram: `Artist Name - Song Title.mp3` 
- No more "🎵 ..." caption text