> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ycloud.com/llms.txt
> Use this file to discover all available pages before exploring further.
# AI Knowledge Base
The Knowledge page lets your AI Agent learn from documents, web pages, and question-and-answer pairs. You can also upload attachments that the AI Agent can send to users without learning from or splitting the file.
Knowledge is shared by all versions of the AI Agent and updates in real time.
## Add knowledge
1. Open your AI Agent and select **Knowledge**.
2. Click **Add knowledge**.
3. Select one of the following knowledge types, then click **Next**:
* **Document**: The AI Agent parses, chunks, and indexes the file so it can answer questions from the content.
* **Online data**: The AI Agent crawls web pages and uses the retrieved content as a knowledge source.
* **Q\&A**: The AI Agent follows a prepared answer for predictable questions.
* **Attachment**: The AI Agent sends the original file when appropriate. It does not learn from or split the file.
4. Complete the setup for the selected type.
## Add a document
1. Select **Document**, then click **Next**.
2. Drag a file into the upload area or click **Upload** to choose a file.
3. After the file finishes uploading, click **Create**.
The maximum file size is 15 MB. Supported formats are:
* TXT, MD, MARKDOWN
* PDF
* HTML, HTM
* XLSX, XLS, CSV
* DOC, DOCX
The AI Agent can recognize text in images embedded in PDF files. Images embedded in other document formats are not supported.
## Add online data
1. Select **Online data**, then click **Next**.
2. Under **Crawl Depth**, choose:
* **Only this URL** to crawl only the URL you enter.
* **Include subpages** to crawl the URL and its subpages.
3. Under **Update Frequency**, choose **Do Not Auto-Update**, **Update every 3 days**, **Update every 7 days**, or **Update every 30 days**.
4. Enter the website URL. To add more URLs in the same operation, click **Add more**.
5. Click **Create** to start crawling.
After an online knowledge source is created, its action menu also lets you preview the crawled page, run a manual update, or change its update settings.
## Add a Q\&A pair
1. Select **Q\&A**, then click **Next**.
2. Enter the expected user question in **Question**.
3. Enter the response the AI Agent should provide in **Answer**.
4. Click **Create**.
Each question and answer can contain up to 1,024 characters.
## Add an attachment
Use an attachment when you want the AI Agent to send a complete file to users, such as a product catalog, image, or video. Attachment content is not parsed, chunked, or used to answer questions.
1. Select **Attachment**, then click **Next**.
2. Click **Upload file** and choose a supported file.
3. Optionally enter a **Display name**. If you leave it blank, the original file name is used. The display name can contain up to 255 characters.
4. Enter a **Content description** that explains when the AI Agent should send the file. The description can contain up to 1,024 characters.
5. Click **Create**.
Attachment limits are:
| File type | Supported formats | Maximum size |
| - | - | - |
| Image | JPEG, JPG, PNG | 5 MB |
| Video | MP4 | 16 MB |
| Document | TXT, PDF, PPT, PPTX, DOC, DOCX, XLS, XLSX | 100 MB |
## Manage knowledge
The Knowledge list shows each item's name, description, type, last updated time, status, and available actions.
* Use **Search by name or url** to find a specific item.
* Use the **Type**, **Last Updated**, and **Status** filters to narrow the list.
* Turn the status switch on to make an item **Used**, or off to make it **Unused**.
* Open an item's action menu to preview, update, change settings, or delete it. Available actions depend on the knowledge type.
* Select one or more items with the checkboxes to delete them in bulk.
Use the **Preview** panel on the right side of the page to test how the AI Agent responds after your knowledge is ready.
This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.