[Python] SendMultiMediaRequest fails silently when sending multiple files [Python/Telethon]

I'm trying to use the SendMultiMediaRequest function from the Telethon library to send a Telegram message that includes several images and some text.

However, the request doesn't work as expected — no message is sent. I'm not sure if I'm using it correctly, or if I'm missing something.

Here is a simplified version of my code:


# Cast to ensure proper data types for channel ID and access hash
channel = InputPeerChannel(channel_id=int(channel_id), access_hash=int(access_hash))

media_group = []
# 'test.png', 'test2.png' are random and different png images
for i, path in enumerate(['test.png', 'test2.png']):

# Upload each image to Telegram
uploaded_photo = await client.upload_file(path)
if not uploaded_photo:
raise RuntimeError(f"Failed to upload file: {path}")

# Define the input media for each photo
media = InputMediaUploadedPhoto(file=uploaded_photo)

# Append the image to the media group
media_group.append(InputSingleMedia(
media=media,
message=text_message if i == 0 else "", # Text only for the first image
random_id=random.getrandbits(63) # Random ID for each media
))

# Calculate the schedule time
schedule_time = datetime.now() + timedelta(minutes=60)

# Send the post as a message
await client(SendMultiMediaRequest(
peer=channel,
multi_media=media_group,
schedule_date=schedule_time
))


Script output: ❌ Unexpected error occurred: Media invalid (caused by SendMultiMediaRequest)

Questions:

• 
  Am I using SendMultiMediaRequest correctly?
  
  
• 
  How can I properly send multiple media items and a caption/text together?
  

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