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letta-server/fern/pages/ade-guide/data_sources.mdx
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---
title: Data Sources
subtitle: Managing data sources in the ADE
slug: guides/ade/data-sources
---
The Data Sources panel in the ADE allows you to connect external files to your agent. When attached, your agent automatically gains file tools to search and access the content.
## Creating Data Sources
To create a new data source:
1. Click the **"data sources"** tab in the bottom-left of the ADE
2. Click the **"create data source"** button
3. Give your data source a descriptive name
New data sources created in the ADE are automatically attached to your current agent.
## Uploading Files
To upload files to a data source:
1. Navigate to the **"data sources"** tab
2. **Drag and drop** files directly into the data sources area, or
3. Click the **upload (+)** button to select files
**Supported formats:** `.pdf`, `.txt`, `.md`, `.json`, `.docx`, `.html`
## Attaching Existing Data Sources
To attach an existing data source:
1. Click the **"data sources"** tab
2. Click **"attach existing"**
3. Select the data source to attach
## Detaching Data Sources
To detach a data source:
1. Navigate to the **"data sources"** tab
2. Click the **"detach"** button next to the data source
When you detach all data sources, the file tools are automatically removed from your agent.