Unable to upload attachment with create message

Question

POST API - https://graph.microsoft.com/v1.0/me/messages
https://learn.microsoft.com/en-us/graph/api/user-post-messages?view=graph-rest-1.0&tabs=http

Request Body-
{
"subject": "IPI-testing: concert",
"body": {
"contentType": "HTML",
"content": "The group represents Washington."
},
"toRecipients": [
{
"emailAddress": {
"address": "aktest@akendratest22.onmicrosoft.com"
}
}
],
"internetMessageHeaders": [
{
"name": "x-custom-header-group-name",
"value": "Washington"
},
{
"name": "x-custom-header-group-id",
"value": "WA001"
}
],
"attachments": [
{
"@odata.type": "#microsoft.graph.fileAttachment",
"name": "attachment.txt",
"contentType": "text/plain",
"contentBytes": "SGVsbG8gV29ybGQh"
}
]
}

Result - working and default attachment is created.

Requirement - We want to upload our own attachments with bigger size we could not find upload attachment option

Answer 1

Hi @persistent_test

This endpoint only supports to attach files that are smaller than 3 MB. To attach larger file in range of 3 MB to 150 MB, I would recommend you to use POST /me/messages/{id}/attachments/createUploadSession

You can follow this resource article for detailed information: https://learn.microsoft.com/en-us/graph/api/attachment-createuploadsession?view=graph-rest-1.0&tabs=http

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Answer 2

Thank you for reply, I want attach file smaller than 3 mb with same API - https://graph.microsoft.com/v1.0/me/messages,
But we could not find option for file attachment option with same API (other than default attachment option )

could you please help here.