> For the complete documentation index, see [llms.txt](https://help.zaapi.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.zaapi.com/integrations/line/limitations.md).
# Limitations
### Message Syncing
When you first integrate LINE with Zaapi, **only new messages (i.e received after integration date) will appear in your inbox**. This is because LINE does not allow any third party to fetch previous conversation history before the first integration.
Also, **any messages sent via the LINE OA native platform directly will not appear in Zaapi**. This is because LINE does not send any third party webhooks (notifications of messages sent) for messages sent on their platform. To ensure all messages appear in Zaapi correctly, you can send all messages in Zaapi only.
***
### **LINE Message Limits**
LINE has limits on the number of messages you can send via an API based on the plan you have paid for in LINE. Messages sent via the API are counted in the same way as broadcast messages. If you exceed this limit, you will receive an error message in Zaapi and you may need to upgrade your plan within LINE OA. You can find more details on this [here](https://help.line.me/official_account/ios/categoryId/20006330/pc?contentId=20011707).
{% hint style="info" %}
If you send a reply from Zaapi within 10 minutes of receiving the customer message, LINE will not count this towards your message limits.
{% endhint %}
For details about LINE monthly plans and limits see the below table:
***
### **File Upload Limitations**
* Image (10 MB)
* Video (30 MB)
***
### **Character Count Limitations**
For LINE messages, you can send a maximum of 1,000 characters in a single response.
***
### Unsupported Messages
Due to limitations with the LINE API, there are a number of messages that we are unable to support in Zaapi. We regularly update this table with the latest API changes and are supporting more messages every week.
| Message | Image Reference | Description |
| -------------- | -------------------------------- | ----------- |
| Shared contact |  | |
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