对话框流对自定义有效负载有任何限制吗？

Question

在Dialogflow中发送自定义有效负载时遇到一些问题。我将Dialogflow与LINE Platform集成在一起。它具有某种称为flex的消息，您可以使用自定义有效负载来发送该消息。问题是当我设置了很长的有效负载时，什么也没有回复用户。但是对于较短的有效负载，可以将其发送回给用户。这是我的有效载荷的一些例子

无效负载

{
    "line": {
  "type": "flex",
  "altText": "Flex Message",
  "contents": {
    "type": "carousel",
    "contents": [
      {
        "type": "bubble",
        "hero": {
          "type": "image",
          "url": "https://scdn.line-apps.com/n/channel_devcenter/img/fx/01_5_carousel.png",
          "size": "full",
          "aspectRatio": "20:13",
          "aspectMode": "cover"
        },
        "body": {
          "type": "box",
          "layout": "vertical",
          "spacing": "sm",
          "contents": [
            {
              "type": "text",
              "text": "Arm Chair, White",
              "size": "xl",
              "weight": "bold",
              "wrap": true
            },
            {
              "type": "box",
              "layout": "baseline",
              "contents": [
                {
                  "type": "text",
                  "text": "$49",
                  "flex": 0,
                  "size": "xl",
                  "weight": "bold",
                  "wrap": true
                },
                {
                  "type": "text",
                  "text": ".99",
                  "flex": 0,
                  "size": "sm",
                  "weight": "bold",
                  "wrap": true
                }
              ]
            }
          ]
        },
        "footer": {
          "type": "box",
          "layout": "vertical",
          "spacing": "sm",
          "contents": [
            {
              "type": "button",
              "action": {
                "type": "uri",
                "label": "Add to Cart",
                "uri": "https://linecorp.com"
              },
              "style": "primary"
            },
            {
              "type": "button",
              "action": {
                "type": "uri",
                "label": "Add to whishlist",
                "uri": "https://linecorp.com"
              }
            }
          ]
        }
      },
      {
        "type": "bubble",
        "hero": {
          "type": "image",
          "url": "https://scdn.line-apps.com/n/channel_devcenter/img/fx/01_6_carousel.png",
          "size": "full",
          "aspectRatio": "20:13",
          "aspectMode": "cover"
        },
        "body": {
          "type": "box",
          "layout": "vertical",
          "spacing": "sm",
          "contents": [
            {
              "type": "text",
              "text": "Metal Desk Lamp",
              "size": "xl",
              "weight": "bold",
              "wrap": true
            },
            {
              "type": "box",
              "layout": "baseline",
              "flex": 1,
              "contents": [
                {
                  "type": "text",
                  "text": "$11",
                  "flex": 0,
                  "size": "xl",
                  "weight": "bold",
                  "wrap": true
                },
                {
                  "type": "text",
                  "text": ".99",
                  "flex": 0,
                  "size": "sm",
                  "weight": "bold",
                  "wrap": true
                }
              ]
            },
            {
              "type": "text",
              "text": "Temporarily out of stock",
              "flex": 0,
              "margin": "md",
              "size": "xxs",
              "color": "#FF5551",
              "wrap": true
            }
          ]
        },
        "footer": {
          "type": "box",
          "layout": "vertical",
          "spacing": "sm",
          "contents": [
            {
              "type": "button",
              "action": {
                "type": "uri",
                "label": "Add to Cart",
                "uri": "https://linecorp.com"
              },
              "flex": 2,
              "color": "#AAAAAA",
              "style": "primary"
            },
            {
              "type": "button",
              "action": {
                "type": "uri",
                "label": "Add to wish list",
                "uri": "https://linecorp.com"
              }
            }
          ]
        }
      },
      {
        "type": "bubble",
        "body": {
          "type": "box",
          "layout": "vertical",
          "spacing": "sm",
          "contents": [
            {
              "type": "button",
              "action": {
                "type": "uri",
                "label": "See more",
                "uri": "https://linecorp.com"
              },
              "flex": 1,
              "gravity": "center"
            }
          ]
        }
      }
    ]
  }
}
}

有效负载

{
    "line":{
  "type": "flex",
  "altText": "Flex Message",
  "contents": {
    "type": "bubble",
    "direction": "ltr",
    "header": {
      "type": "box",
      "layout": "vertical",
      "contents": [
        {
          "type": "text",
          "text": "Header",
          "align": "center"
        }
      ]
    },
    "hero": {
      "type": "image",
      "url": "https://developers.line.biz/assets/images/services/bot-designer-icon.png",
      "size": "full",
      "aspectRatio": "1.51:1",
      "aspectMode": "fit"
    },
    "body": {
      "type": "box",
      "layout": "vertical",
      "contents": [
        {
          "type": "text",
          "text": "Body",
          "align": "center"
        }
      ]
    },
    "footer": {
      "type": "box",
      "layout": "horizontal",
      "contents": [
        {
          "type": "button",
          "action": {
            "type": "uri",
            "label": "Button",
            "uri": "https://linecorp.com"
          }
        }
      ]
    }
  }
}
}

我已经检查了两个有效载荷在LINE平台中是否均已纠正，并且可以使用外部工具发送。

我的想法，在Dialogflow中使用自定义有效负载存在有效负载大小限制或其他限制。

有人对此有想法吗？