Add attachment

Article
2024-06-21

Namespace: microsoft.graph

Use this API to add an attachment to an existing event. This operation limits the size of the attachment you can add to under 3 MB.

If an organizer adds an attachment to a meeting event, the organizer can subsequently update the event to send the attachment and update the event for each attendee as well.

This API is available in the following national cloud deployments.

Global service	US Government L4	US Government L5 (DOD)	China operated by 21Vianet
✅	✅	✅	✅

Permissions

Choose the permission or permissions marked as least privileged for this API. Use a higher privileged permission or permissions only if your app requires it. For details about delegated and application permissions, see Permission types. To learn more about these permissions, see the permissions reference.

Permission type	Least privileged permissions	Higher privileged permissions
Delegated (work or school account)	Calendars.ReadWrite	Not available.
Delegated (personal Microsoft account)	Calendars.ReadWrite	Not available.
Application	Calendars.ReadWrite	Not available.

HTTP request

Attachments for an event in the user's default calendar.

POST /me/events/{id}/attachments
POST /users/{id | userPrincipalName}/events/{id}/attachments

POST /me/calendar/events/{id}/attachments
POST /users/{id | userPrincipalName}/calendar/events/{id}/attachments

Attachments for an event in a calendar belonging to the user's default calendarGroup.

POST /me/calendars/{id}/events/{id}/attachments
POST /users/{id | userPrincipalName}/calendars/{id}/events/{id}/attachments

Attachments for an event in a calendar belonging to a user's calendarGroup.

POST /me/calendarGroups/{id}/calendars/{id}/events/{id}/attachments
POST /users/{id | userPrincipalName}/calendarGroups/{id}/calendars/{id}/events/{id}/attachments

Request headers

Name	Type	Description
Authorization	string	Bearer {token}. Required. Learn more about authentication and authorization.
Content-Type	string	Nature of the data in the body of an entity. Required.

Request body

In the request body, supply a JSON representation of attachment object.

Response

If successful, this method returns 201 Created response code and attachment object in the response body.

Example (file attachment)

Request

The following example shows a request.

POST https://graph.microsoft.com/v1.0/me/events/AAMkAGI1AAAt9AHjAAA=/attachments
Content-type: application/json

{
    "@odata.type": "#microsoft.graph.fileAttachment",
    "name": "menu.txt",
    "contentBytes": "base64bWFjIGFuZCBjaGVlc2UgdG9kYXk="   
}


// 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 = "menu.txt",
	ContentBytes = Convert.FromBase64String("base64bWFjIGFuZCBjaGVlc2UgdG9kYXk="),
};

// To initialize your graphClient, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=csharp
var result = await graphClient.Me.Events["{event-id}"].Attachments.PostAsync(requestBody);



mgc users events attachments create --user-id {user-id} --event-id {event-id} --body '{\
    "@odata.type": "#microsoft.graph.fileAttachment",\
    "name": "menu.txt",\
    "contentBytes": "base64bWFjIGFuZCBjaGVlc2UgdG9kYXk="   \
}\
'



// Code snippets are only available for the latest major version. Current major version is $v1.*

// Dependencies
import (
	  "context"
	  msgraphsdk "github.com/microsoftgraph/msgraph-sdk-go"
	  graphmodels "github.com/microsoftgraph/msgraph-sdk-go/models"
	  //other-imports
)

requestBody := graphmodels.NewAttachment()
name := "menu.txt"
requestBody.SetName(&name) 
contentBytes := []byte("base64bWFjIGFuZCBjaGVlc2UgdG9kYXk=")
requestBody.SetContentBytes(&contentBytes) 

// To initialize your graphClient, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=go
attachments, err := graphClient.Me().Events().ByEventId("event-id").Attachments().Post(context.Background(), requestBody, nil)


// 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("menu.txt");
byte[] contentBytes = Base64.getDecoder().decode("base64bWFjIGFuZCBjaGVlc2UgdG9kYXk=");
attachment.setContentBytes(contentBytes);
Attachment result = graphClient.me().events().byEventId("{event-id}").attachments().post(attachment);


const options = {
	authProvider,
};

const client = Client.init(options);

const attachment = {
    '@odata.type': '#microsoft.graph.fileAttachment',
    name: 'menu.txt',
    contentBytes: 'base64bWFjIGFuZCBjaGVlc2UgdG9kYXk='   
};

await client.api('/me/events/AAMkAGI1AAAt9AHjAAA=/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('menu.txt');
$requestBody->setContentBytes(\GuzzleHttp\Psr7\Utils::streamFor(base64_decode('base64bWFjIGFuZCBjaGVlc2UgdG9kYXk=')));

$result = $graphServiceClient->me()->events()->byEventId('event-id')->attachments()->post($requestBody)->wait();


Import-Module Microsoft.Graph.Calendar

$params = @{
	"@odata.type" = "#microsoft.graph.fileAttachment"
	name = "menu.txt"
	contentBytes = "base64bWFjIGFuZCBjaGVlc2UgdG9kYXk="
}

# A UPN can also be used as -UserId.
New-MgUserEventAttachment -UserId $userId -EventId $eventId -BodyParameter $params


# Code snippets are only available for the latest version. Current version is 1.x
from msgraph import GraphServiceClient
from msgraph.generated.models.file_attachment import FileAttachment
# To initialize your graph_client, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=python
request_body = FileAttachment(
	odata_type = "#microsoft.graph.fileAttachment",
	name = "menu.txt",
	content_bytes = base64.urlsafe_b64decode("base64bWFjIGFuZCBjaGVlc2UgdG9kYXk="),
)

result = await graph_client.me.events.by_event_id('event-id').attachments.post(request_body)

In the request body, supply a JSON representation of attachment object.

Response

The following example shows the response.

HTTP 201 Created
Content-type: application/json

{
    "@odata.context":"https://graph.microsoft.com/v1.0/$metadata#users('cd209b0b-3f83-4c35-82d2-d88a61820480')/events('AAMkAGI1AAAt9AHjAAA%3D')/attachments/$entity",
    "@odata.type":"#microsoft.graph.fileAttachment",
    "id":"AAMkAGI1AAAt9AHjAAABEgAQAEdBogju-MJEu6Ngg-1_W0g=",
    "lastModifiedDateTime":"2017-04-15T03:21:49Z",
    "name":"menu.txt",
    "contentType":"text/plain",
    "size":178,
    "isInline":false,
    "contentId":null,
    "contentLocation":null,
    "contentBytes":"bWFjIGFuZCBjaGVlc2UgdG9kYXk="
}

Example (item attachment)

Request

Here is an example which attaches an event with another event as an item attachment.

POST https://graph.microsoft.com/v1.0/me/events/AAMkAGI1AAAt9AHjAAA=/attachments
Content-type: application/json

{
  "@odata.type": "#microsoft.graph.itemAttachment",
  "name": "Holiday event", 
  "item": {
        "@odata.type": "microsoft.graph.event",
        "subject": "Discuss gifts for children",
        "body": {
            "contentType": "HTML",
            "content": "Let's look for funding!"
         },
         "start": {
             "dateTime": "2016-12-02T18:00:00",
             "timeZone": "Pacific Standard Time"
          },
          "end": {
             "dateTime": "2016-12-02T19:00:00",
             "timeZone": "Pacific Standard Time"
          }
    }
}


// Code snippets are only available for the latest version. Current version is 5.x

// Dependencies
using Microsoft.Graph.Models;

var requestBody = new ItemAttachment
{
	OdataType = "#microsoft.graph.itemAttachment",
	Name = "Holiday event",
	Item = new Event
	{
		OdataType = "microsoft.graph.event",
		Subject = "Discuss gifts for children",
		Body = new ItemBody
		{
			ContentType = BodyType.Html,
			Content = "Let's look for funding!",
		},
		Start = new DateTimeTimeZone
		{
			DateTime = "2016-12-02T18:00:00",
			TimeZone = "Pacific Standard Time",
		},
		End = new DateTimeTimeZone
		{
			DateTime = "2016-12-02T19:00:00",
			TimeZone = "Pacific Standard Time",
		},
	},
};

// To initialize your graphClient, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=csharp
var result = await graphClient.Me.Events["{event-id}"].Attachments.PostAsync(requestBody);



mgc users events attachments create --user-id {user-id} --event-id {event-id} --body '{\
  "@odata.type": "#microsoft.graph.itemAttachment",\
  "name": "Holiday event", \
  "item": {\
        "@odata.type": "microsoft.graph.event",\
        "subject": "Discuss gifts for children",\
        "body": {\
            "contentType": "HTML",\
            "content": "Let's look for funding!"\
         },\
         "start": {\
             "dateTime": "2016-12-02T18:00:00",\
             "timeZone": "Pacific Standard Time"\
          },\
          "end": {\
             "dateTime": "2016-12-02T19:00:00",\
             "timeZone": "Pacific Standard Time"\
          }\
    }\
}\
'



// Code snippets are only available for the latest major version. Current major version is $v1.*

// Dependencies
import (
	  "context"
	  msgraphsdk "github.com/microsoftgraph/msgraph-sdk-go"
	  graphmodels "github.com/microsoftgraph/msgraph-sdk-go/models"
	  //other-imports
)

requestBody := graphmodels.NewAttachment()
name := "Holiday event"
requestBody.SetName(&name) 
item := graphmodels.NewEvent()
subject := "Discuss gifts for children"
item.SetSubject(&subject) 
body := graphmodels.NewItemBody()
contentType := graphmodels.HTML_BODYTYPE 
body.SetContentType(&contentType) 
content := "Let's look for funding!"
body.SetContent(&content) 
item.SetBody(body)
start := graphmodels.NewDateTimeTimeZone()
dateTime := "2016-12-02T18:00:00"
start.SetDateTime(&dateTime) 
timeZone := "Pacific Standard Time"
start.SetTimeZone(&timeZone) 
item.SetStart(start)
end := graphmodels.NewDateTimeTimeZone()
dateTime := "2016-12-02T19:00:00"
end.SetDateTime(&dateTime) 
timeZone := "Pacific Standard Time"
end.SetTimeZone(&timeZone) 
item.SetEnd(end)
requestBody.SetItem(item)

// To initialize your graphClient, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=go
attachments, err := graphClient.Me().Events().ByEventId("event-id").Attachments().Post(context.Background(), requestBody, nil)


// Code snippets are only available for the latest version. Current version is 6.x

GraphServiceClient graphClient = new GraphServiceClient(requestAdapter);

ItemAttachment attachment = new ItemAttachment();
attachment.setOdataType("#microsoft.graph.itemAttachment");
attachment.setName("Holiday event");
Event item = new Event();
item.setOdataType("microsoft.graph.event");
item.setSubject("Discuss gifts for children");
ItemBody body = new ItemBody();
body.setContentType(BodyType.Html);
body.setContent("Let's look for funding!");
item.setBody(body);
DateTimeTimeZone start = new DateTimeTimeZone();
start.setDateTime("2016-12-02T18:00:00");
start.setTimeZone("Pacific Standard Time");
item.setStart(start);
DateTimeTimeZone end = new DateTimeTimeZone();
end.setDateTime("2016-12-02T19:00:00");
end.setTimeZone("Pacific Standard Time");
item.setEnd(end);
attachment.setItem(item);
Attachment result = graphClient.me().events().byEventId("{event-id}").attachments().post(attachment);


const options = {
	authProvider,
};

const client = Client.init(options);

const attachment = {
  '@odata.type': '#microsoft.graph.itemAttachment',
  name: 'Holiday event', 
  item: {
        '@odata.type': 'microsoft.graph.event',
        subject: 'Discuss gifts for children',
        body: {
            contentType: 'HTML',
            content: 'Let\'s look for funding!'
         },
         start: {
             dateTime: '2016-12-02T18:00:00',
             timeZone: 'Pacific Standard Time'
          },
          end: {
             dateTime: '2016-12-02T19:00:00',
             timeZone: 'Pacific Standard Time'
          }
    }
};

await client.api('/me/events/AAMkAGI1AAAt9AHjAAA=/attachments')
	.post(attachment);


<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Models\ItemAttachment;
use Microsoft\Graph\Generated\Models\Event;
use Microsoft\Graph\Generated\Models\ItemBody;
use Microsoft\Graph\Generated\Models\BodyType;
use Microsoft\Graph\Generated\Models\DateTimeTimeZone;


$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);

$requestBody = new ItemAttachment();
$requestBody->setOdataType('#microsoft.graph.itemAttachment');
$requestBody->setName('Holiday event');
$item = new Event();
$item->setOdataType('microsoft.graph.event');
$item->setSubject('Discuss gifts for children');
$itemBody = new ItemBody();
$itemBody->setContentType(new BodyType('hTML'));
$itemBody->setContent('Let\'s look for funding!');
$item->setBody($itemBody);
$itemStart = new DateTimeTimeZone();
$itemStart->setDateTime('2016-12-02T18:00:00');
$itemStart->setTimeZone('Pacific Standard Time');
$item->setStart($itemStart);
$itemEnd = new DateTimeTimeZone();
$itemEnd->setDateTime('2016-12-02T19:00:00');
$itemEnd->setTimeZone('Pacific Standard Time');
$item->setEnd($itemEnd);
$requestBody->setItem($item);

$result = $graphServiceClient->me()->events()->byEventId('event-id')->attachments()->post($requestBody)->wait();


Import-Module Microsoft.Graph.Calendar

$params = @{
	"@odata.type" = "#microsoft.graph.itemAttachment"
	name = "Holiday event"
	item = @{
		"@odata.type" = "microsoft.graph.event"
		subject = "Discuss gifts for children"
		body = @{
			contentType = "HTML"
			content = "Let's look for funding!"
		}
		start = @{
			dateTime = "2016-12-02T18:00:00"
			timeZone = "Pacific Standard Time"
		}
		end = @{
			dateTime = "2016-12-02T19:00:00"
			timeZone = "Pacific Standard Time"
		}
	}
}

# A UPN can also be used as -UserId.
New-MgUserEventAttachment -UserId $userId -EventId $eventId -BodyParameter $params


# Code snippets are only available for the latest version. Current version is 1.x
from msgraph import GraphServiceClient
from msgraph.generated.models.item_attachment import ItemAttachment
from msgraph.generated.models.event import Event
from msgraph.generated.models.item_body import ItemBody
from msgraph.generated.models.body_type import BodyType
from msgraph.generated.models.date_time_time_zone import DateTimeTimeZone
# To initialize your graph_client, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=python
request_body = ItemAttachment(
	odata_type = "#microsoft.graph.itemAttachment",
	name = "Holiday event",
	item = Event(
		odata_type = "microsoft.graph.event",
		subject = "Discuss gifts for children",
		body = ItemBody(
			content_type = BodyType.Html,
			content = "Let's look for funding!",
		),
		start = DateTimeTimeZone(
			date_time = "2016-12-02T18:00:00",
			time_zone = "Pacific Standard Time",
		),
		end = DateTimeTimeZone(
			date_time = "2016-12-02T19:00:00",
			time_zone = "Pacific Standard Time",
		),
	),
)

result = await graph_client.me.events.by_event_id('event-id').attachments.post(request_body)

Response

The following example shows the response.

HTTP 201 Created
Content-type: application/json

{
    "@odata.context":"https://graph.microsoft.com/v1.0/$metadata#me/events('AAMkAGI1AAAt9AHjAAA=')/attachments/$entity",
    "@odata.type":"#microsoft.graph.itemAttachment",
    "@odata.id":"https://graph.microsoft.com/v1.0/users('fdcbcf34-2505-4d07-be5b-0a55b699d157@41a5b830-45ac-4f1b-9bfc-baafa3b7db2e')/events('AAMkAGI1AAAt9AHjAAA=')/attachments('AAMkADNkN2Jp5JVnQIe9r0=')",
    "id":"AAMkADNkNJp5JVnQIe9r0=",
    "lastModifiedDateTime":"2016-12-01T22:27:13Z",
    "name":"Holiday event",
    "contentType":null,
    "size":2473,
    "isInline":false
}

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Add attachment

Permissions

HTTP request

Request headers

Request body

Response

Example (file attachment)

Request

Response

Example (item attachment)

Request

Response

Feedback

Additional resources