tasks.template.checklist.addAttachmentByContent

curl -X POST \
-H "Content-Type: application/json" \
-H "Accept: application/json" \
-d '{
  "templateId": 139,
  "checkListItemId": 37,
  "attachmentParameters": {
    "NAME": "dashboard-note.txt",
    "CONTENT": "RGFzaGJvYXJkIG5vdGU="
  },
  "auth": "**put_access_token_here**"
}' \
https://**put_your_bitrix24_address**/rest/tasks.template.checklist.addAttachmentByContent

// This snippet is an ES module: top-level await requires type="module" or a bundler.
// $b24 is an already-initialized SDK instance (see the SDK "Get started" guide).
import { Text } from '@bitrix24/b24jssdk'
import type { B24Frame } from '@bitrix24/b24jssdk'

declare const $b24: B24Frame

// Shape of the payload returned in result (match the "response handling" section of the page)
type CheckListItemResult = {
  checkListItem: {
    id: number
    copiedId: number | null
    userId: number
    createdBy: number | null
    parentId: number
    title: string
    sortIndex: number
    displaySortIndex: string
    isComplete: boolean
    isImportant: boolean
    completedCount: number
    members: Array<{
      id: string
      type: string
      name: string
      personalPhoto: string
      personalGender: string
      image: string
      isCollaber: boolean
    }>
    attachments: unknown[]
    nodeId: number | null
    templateId: number
  }
}

try {
  const response = await $b24.actions.v2.call.make<CheckListItemResult>({
    method: 'tasks.template.checklist.addAttachmentByContent',
    params: {
      templateId: 139,
      checkListItemId: 37,
      attachmentParameters: {
        NAME: 'dashboard-note.txt',
        CONTENT: 'RGFzaGJvYXJkIG5vdGU=',
      },
    },
    requestId: Text.getUuidRfc4122()
  })

  // The payload is available only on a successful response
  if (!response.isSuccess) {
    console.error(response.getErrorMessages().join('; '))
  } else {
    const result = response.getData()!.result
    console.info(result.checkListItem.id, result.checkListItem.title)
  }
} catch (error) {
  // Thrown on transport or SDK failures (AjaxError, SdkError, etc.)
  console.error(error)
}

<!-- Load the SDK (UMD build); it is exposed as the global B24Js -->
<script src="https://unpkg.com/@bitrix24/b24jssdk@1/dist/umd/index.min.js"></script>
<script>
  async function addAttachmentByContent() {
    try {
      // Initialize the SDK inside a Bitrix24 frame
      const $b24 = await B24Js.initializeB24Frame()

      const response = await $b24.actions.v2.call.make({
        method: 'tasks.template.checklist.addAttachmentByContent',
        params: {
          templateId: 139,
          checkListItemId: 37,
          attachmentParameters: {
            NAME: 'dashboard-note.txt',
            CONTENT: 'RGFzaGJvYXJkIG5vdGU=',
          },
        },
        requestId: B24Js.Text.getUuidRfc4122()
      })

      // The payload is available only on a successful response
      if (!response.isSuccess) {
        console.error(response.getErrorMessages().join('; '))
        return
      }

      const result = response.getData().result
      console.info(result.checkListItem.id, result.checkListItem.title)
    } catch (error) {
      // Thrown on transport or SDK failures (AjaxError, SdkError, etc.)
      console.error(error)
    }
  }

  document.addEventListener('DOMContentLoaded', addAttachmentByContent)
</script>

from b24pysdk.errors import BitrixAPIError, BitrixSDKException

attachment_parameters = {
    "NAME": "dashboard-note.txt",
    "CONTENT": "RGFzaGJvYXJkIG5vdGU=",
}

try:
    bitrix_response = client.tasks.template.checklist.add_attachment_by_content(
        template_id=139,
        check_list_item_id=37,
        attachment_parameters=attachment_parameters,
    ).response
    result = bitrix_response.result
    print(result)
except BitrixAPIError as error:
    print(
        "Ошибка Bitrix API",
        f"error: {error.error}",
        f"error_description: {error.error_description}",
        sep="\n",
    )
except BitrixSDKException as error:
    print(f"Ошибка Bitrix SDK: {error.message}")
except Exception as error:
    print(f"Непредвиденная ошибка: {error}")

try {
    $response = $b24Service
        ->core
        ->call(
            'tasks.template.checklist.addAttachmentByContent',
            [
                'templateId' => 139,
                'checkListItemId' => 37,
                'attachmentParameters' => [
                    'NAME' => 'dashboard-note.txt',
                    'CONTENT' => 'RGFzaGJvYXJkIG5vdGU='
                ]
            ]
        );

    $result = $response
        ->getResponseData()
        ->getResult();

    print_r($result);
} catch (Throwable $e) {
    echo $e->getMessage();
}

BX24.callMethod(
    'tasks.template.checklist.addAttachmentByContent',
    {
        templateId: 139,
        checkListItemId: 37,
        attachmentParameters: {
            NAME: 'dashboard-note.txt',
            CONTENT: 'RGFzaGJvYXJkIG5vdGU='
        }
    },
    function(result)
    {
        if (result.error())
        {
            console.error(result.error());
        }
        else
        {
            console.log(result.data());
        }
    }
);

require_once('crest.php');

$result = CRest::call(
    'tasks.template.checklist.addAttachmentByContent',
    [
        'templateId' => 139,
        'checkListItemId' => 37,
        'attachmentParameters' => [
            'NAME' => 'dashboard-note.txt',
            'CONTENT' => 'RGFzaGJvYXJkIG5vdGU='
        ]
    ]
);

print_r($result);

// client и ctx уже созданы — см. раздел «SDK для Go»
res, err := client.Core().Call(ctx, "tasks.template.checklist.addAttachmentByContent", b24.Params{
	"templateId":      139,
	"checkListItemId": 37,
	"attachmentParameters": b24.Params{
		"NAME":    "dashboard-note.txt",
		"CONTENT": "RGFzaGJvYXJkIG5vdGU=",
	},
})
if err != nil {
	return fmt.Errorf("tasks.template.checklist.addAttachmentByContent: %w", err)
}

// Метод заворачивает ответ в объект с ключом "checkListItem".
raw, ok := b24.Unwrap(res.Result, "checkListItem")
if !ok {
	return fmt.Errorf("в ответе нет ключа checkListItem")
}

var item struct {
	ID               b24.ID `json:"id"`
	UserID           b24.ID `json:"userId"`
	ParentID         b24.ID `json:"parentId"`
	Title            string `json:"title"`
	SortIndex        int    `json:"sortIndex"`
	DisplaySortIndex string `json:"displaySortIndex"`
}
if err := json.Unmarshal(raw, &item); err != nil {
	return fmt.Errorf("разбор ответа: %w", err)
}
fmt.Println(item.ID, item.UserID)