ADMIN_ATTACHMENT_CHECK Admin Endpoint
  /rpc/admin/?method=ADMIN_ATTACHMENT_CHECK  
  Superuser only method to check if an attachment file exists.  
  PARAMETERS TYPE NOTES
  AllSpaces Text (1) Y / N [default]
  Id Numeric Mandatory. Id of the attachment.
  RemoveIfNotExists Text (1) Y / N [default]
  RETURN  
  Exists Y / N
  Location  
  OnS3 Y / N. Indicates if the file is on S3
  Removed Y / N