Function getAttachment

Returns Promise<
    {
        author?: {
            active?: boolean;
            avatarUrls?: Record<string, string>;
            displayName?: string;
            emailAddress?: string;
            key?: string;
            name?: string;
            self?: string;
            timeZone?: string;
            [key: string]: unknown;
        };
        content?: string;
        created?: string;
        filename?: string;
        id?: string;
        mimeType?: string;
        properties?: Record<string, any>;
        self?: string;
        size?: number;
        thumbnail?: string;
        [key: string]: unknown;
    },
>