POST /me/mailFolders/{id}/childFolders/{id}/.../messages/{id}/attachments/{id}
POST /users/{id | userPrincipalName}/mailFolders/{id}/childFolders/{id}/messages/{id}/attachments/{id}
// Code snippets are only available for the latest version. Current version is 5.x
// Dependencies
using Microsoft.Graph.Models;
var requestBody = new FileAttachment
{
OdataType = "#microsoft.graph.fileAttachment",
Name = "smile",
ContentBytes = Convert.FromBase64String("R0lGODdhEAYEAA7"),
};
// To initialize your graphClient, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=csharp
var result = await graphClient.Me.Messages["{message-id}"].Attachments.PostAsync(requestBody);
// Code snippets are only available for the latest version. Current version is 6.x
GraphServiceClient graphClient = new GraphServiceClient(requestAdapter);
FileAttachment attachment = new FileAttachment();
attachment.setOdataType("#microsoft.graph.fileAttachment");
attachment.setName("smile");
byte[] contentBytes = Base64.getDecoder().decode("R0lGODdhEAYEAA7");
attachment.setContentBytes(contentBytes);
Attachment result = graphClient.me().messages().byMessageId("{message-id}").attachments().post(attachment);
<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Models\FileAttachment;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new FileAttachment();
$requestBody->setOdataType('#microsoft.graph.fileAttachment');
$requestBody->setName('smile');
$requestBody->setContentBytes(\GuzzleHttp\Psr7\Utils::streamFor(base64_decode('R0lGODdhEAYEAA7')));
$result = $graphServiceClient->me()->messages()->byMessageId('message-id')->attachments()->post($requestBody)->wait();
Import-Module Microsoft.Graph.Mail
$params = @{
"@odata.type" = "#microsoft.graph.fileAttachment"
name = "smile"
contentBytes = "R0lGODdhEAYEAA7"
}
# A UPN can also be used as -UserId.
New-MgUserMessageAttachment -UserId $userId -MessageId $messageId -BodyParameter $params