How to send 2 or more existing photos (by fileID) with text?

[resssoft]

NewMessage - send text only
NewPhotoShare - send one photo by fileID (without text)
NewMediaGroup - 2 or more new files (without text)
...
?

[Syfaro]

Each InputMediaPhoto has a Caption field which can be set to arbitrary text. Telegram clients only show a caption from a media group below the media if exactly one element has a caption set, official clients seem to set the first photo's caption.