---
title: "Upload attachment"
method: POST
path: "/v1/projects/{projectId}/registrations/{registrationId}/attachments/{attachmentId}"
tags: ["registrations"]
---

# Upload attachment

`POST /v1/projects/{projectId}/registrations/{registrationId}/attachments/{attachmentId}`

Through this endpoint, attachments can be added to registrations. The required attachments for each registration can be retrieved from the get policy endpoint.

## Path parameters

- `projectId` string, required
- `registrationId` string, required
- `attachmentId` string, required

## Response `200`

Document uploaded successfully

## Other responses

- `400` — Registration status is not valid for including attachments
- `404` — registration/document not found
- `413` — Document is too large to upload

---

[API](https://skmtc.net/sinch/apis/sinch-sender-id-registrations-api.md) · [All operations](https://skmtc.net/sinch/apis/sinch-sender-id-registrations-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/sinch/sinch-sender-id-registrations-api/revisions/e93587db2688/schema)