Python Telegram Bot Inconsistently Handling Messages

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1

Sometimes my Python Telegram bot does not react when users send photos or PDFs. The message handler is skipped. Here is a sample code for reference:

import telegram
from telegram.ext import Updater, CommandHandler, MessageHandler, Filters, ConversationHandler

STEP = 1

def start_session(update, context):
    update.message.reply_text('Use /send to continue.')
    return ConversationHandler.END

def send_command(update, context):
    update.message.reply_text('Please send your file.')
    return STEP

def handle_file(update, context):
    print('Message processed...')
    update.message.reply_text('File received!')
    return ConversationHandler.END

def abort_process(update, context):
    print('Operation aborted')
    return start_session(update, context)

def run_bot():
    updater = Updater('YOUR_API_TOKEN')
    dispatcher = updater.dispatcher
    conv_handler = ConversationHandler(
        entry_points=[CommandHandler('send', send_command), MessageHandler(Filters.text, start_session)],
        states={
            STEP: [CommandHandler('cancel', abort_process), MessageHandler(Filters.all, handle_file)]
        },
        fallbacks=[CommandHandler('cancel', abort_process)],
        conversation_timeout=60
    )
    dispatcher.add_handler(conv_handler)
    updater.start_polling()
    updater.idle()

if __name__ == '__main__':
    run_bot()
2

I encountered a similar issue in my project where the conversation handler seemed to miss certain file types. The problem turned out to be how the updates were filtered. Instead of lumping all kinds of messages under a generic handler, I separated commands from media-specific filters and set dedicated handlers for photos, documents, and other files. After refactoring the handlers to account for all file types explicitly, the bot became consistent in processing updates. Reorganizing the flow ensured that media updates were not accidentally filtered out by text-based handlers.

3

hey, maybe the issue is the filter ordering. try tweaking the handlers so media messages get processed explicitly. sometimes telegram messes up the multiplexer.