export interface APIAttachmentSee also: https://discord.com/developers/docs/resources/message#attachment-object-attachment-structure
optionalexternalcontent_type? : string 
The attachment's media type
See also: https://en.wikipedia.org/wiki/Media_type
optionalexternaldescription? : string 
Description for the file
optionalexternalduration_secs? : number 
The duration of the audio file (currently for voice messages)
optionalexternalephemeral? : boolean 
Whether this attachment is ephemeral
externalfilename : string 
Name of file attached
optionalexternalflags? : AttachmentFlags 
Attachment flags combined as a bitfield
externalid : Snowflake 
Attachment id
externalproxy_url : string 
A proxied url of file
externalsize : number 
Size of file in bytes
optionalexternaltitle? : string 
The title of the file
externalurl : string 
Source url of file
optionalexternalwaveform? : string 
Base64 encoded bytearray representing a sampled waveform (currently for voice messages)