POST/api/im/files/confirmConfirm uploadPOST/api/im/files/presignGet presigned upload URLGET/api/im/files/quotaGet storage quotaGET/api/im/files/typesList allowed MIME typesPOST/api/im/files/upload/completeComplete multipart uploadPOST/api/im/files/upload/initInitiate multipart uploadDELETE/api/im/files/{uploadId}Delete uploaded filePOST/api/im/files/dev-upload/{uploadId}Dev-only local file uploadGET/api/im/files/dev-download/{uploadId}/{fileName}Dev-only local file download