Upload a file to a task as an attachment. Note: This request uses multipart/form-data as the content type.
If you want to reference a task by it's custom task id, this value must be true.
true
Only used when the custom_task_ids parameter is set to true. For example: custom_task_ids=true&team_id=123.
custom_task_ids
custom_task_ids=true&team_id=123
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