Telegram API, method - sendMediaGroup?

Question

API

Who in the subject please clarify to me the use of this method.
Can I submit Albums consisting of strictly one media type, or is it acceptable to use "mixed" data?

bot.sendMediaGroup(ID, [
  {
    type: 'photo',
    media: 'https://photo_path.jpg'
  },
  {
    type: 'photo',
    media: 'https://photo_path.jpg'
  },
  {
    type: 'video',
    media: 'https://video_path.mp4'
  },
  {
    type: 'video',
    media: 'https://video_path.mp4'
  }
]);

Answer 1

https://core.telegram.org/bots/api/#sendmediagroup
The value of the "media" field must be an Array of InputMediaPhoto and InputMediaVideo (an array of InputMediaPhoto and/or InputMediaVideo). Moreover, photos and videos can be mixed (from 2 to 10 pieces).

Answer 2

for 2021
https://core.telegram.org/bots/api/#sendmediagroup
"Documents and audio files can only be grouped into an album with messages of the same type"