> ## Documentation Index
> Fetch the complete documentation index at: https://help.thedouble.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Global Knowledge Base

The global Knowledge Base is your central data library. Upload once, assign to any Double — so you're not re-uploading the same files for every profile.

Go to **Knowledge Base** from the main sidebar to get started.

**Training words limit** is shown at the top right — tracks how much of your plan's capacity you've used (e.g. 2.244k / 5000k words).

### **Data Sources**

Choose how you want to add knowledge:

| **Source**             | **What it does**                           |
| ---------------------- | ------------------------------------------ |
| **Upload PDF**         | Upload long-form documents and files       |
| **Text**               | Paste custom knowledge directly as text    |
| **Image**              | Add charts, diagrams, and visual content   |
| **Website URL**        | Pull in websites, docs, and public pages   |
| \*\*Substack \*\*      | Posts and articles from a publication      |
| **LinkedIn** ⭐ Paid    | Ingest posts and articles from the account |
| **X / Twitter** (Soon) | Ingest tweets authored by the account      |
| **YouTube** ⭐Paid      | Transcribe and ingest videos               |

⭐ LinkedIn and YouTube are available on Paid plans only.

### **Knowledge Library**

All your uploaded data sources live here. Use it to manage, organize, and assign content across your Doubles.

#### **What you can do**

* **Search** — find any file, text, or source instantly using the search bar
* **New folder** — organize sources into folders
* **Filter by Type** — filter by PDF, text, image, URL, etc.
* **Filter Doubles** — see which sources are assigned to which Double

#### **Library columns**

| **Column**   | **What it shows**                        |
| ------------ | ---------------------------------------- |
| **Name**     | File or source name                      |
| **Type**     | PDF, text, image, URL, etc.              |
| **Size**     | Data size of the source                  |
| **Assigned** | Which Doubles this source is assigned to |
| **Updated**  | Last updated date                        |

#### **What to know**

* Sources added here are global — they're not automatically assigned to a Double. You assign them manually from each Double's Knowledge & Training page.
* To see what's currently training a specific Double, go to that Double's **Knowledge & Training** section.

**Next steps:**

* Managing Knowledge base (Double level)
* Adding a Data Source