---
title: "Changes to Create large file attachment upload session"
method: POST
path: "/me/messages/{messageId}/attachments/createUploadSession"
---

# Changes to Create large file attachment upload session

`POST /me/messages/{messageId}/attachments/createUploadSession`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 2 of 10 revisions.

- **2026-05-27** `354d90657cdd` — 1 info
- **2026-05-26** `c6fc1d98f528` — 1 info

## Changes

- **2026-05-27** `354d90657cdd` — 1 info
  - api operation id `me.messages.message.attachments.createUploadSession` removed and replaced with `createUploadSession`
- **2026-05-26** `c6fc1d98f528` — 1 info
  - api operation id `createUploadSession` removed and replaced with `me.messages.message.attachments.createUploadSession`

---

[Operation](https://skmtc.dev/ballerina-platform/apis/microsoft-graph-mail-api/docs/me/messages/:messageId/attachments/createUploadSession/post.md) · [API](https://skmtc.dev/ballerina-platform/apis/microsoft-graph-mail-api.md) · [Page](https://skmtc.dev/ballerina-platform/apis/microsoft-graph-mail-api/changes/me/messages/:messageId/attachments/createUploadSession/post)