Add remote file

POST https://slack.com/api/files.remote.add

Request Body

[{"name"=>"external_id", "value"=>"{{apitemplate_transaction_id}}", "datatype"=>"string"}, {"name"=>"external_url", "value"=>"{{coverage_report_url}}", "datatype"=>"string"}, {"name"=>"title", "value"=>"{{project_id}} Coverage Report - {{current_date}}", "datatype"=>"string"}]