post
https://live.getsilverfin.com/api/v4/f//companies//client_meetings/external_notes
Upload an external note to the current client meeting for the specified
company.
Supported file types: .aac .flac .mp3 .mpa .mpeg .mpga .mp4 .opus .pcm
.wav .webm .png .jpg .jpeg .webp .txt
Required scope: client_meetings:external_notes:write