Use case: An instructor wants to send individual messages to each student in the course a scanned copy of the midterm/final exam.
I've been looking for a way to upload attachments via the API. The documentation shows it's possible to add attachment IDs, as there is a "attachment_ids" param. It says these IDs comes from files previously uploaded to the “conversation attachments” folder.
It sounds like Joshua here was able to upload via the API to the conversation attachments folder: API problem: attachments in create conversations
I would really appreciate any pointers!