Submission Comments API
This API can be used to create files to attach to submission comments. The submission comments themselves can be created using the Submissions API.
Upload a file SubmissionCommentsApiController#create_file
POST /api/v1/courses/:course_id/assignments/:assignment_id/submissions/:user_id/comments/files
Upload a file to attach to a submission comment
See the File Upload Documentation for details on the file upload workflow.
The final step of the file upload workflow will return the attachment data, including the new file id. The caller can then PUT the file_id to the submission API to attach it to a comment