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

# Content processing pipeline

> Understand the Stored, Extracted, Indexed, and Mapped stages behind each Content Library document.

## Why processing has four stages

Uploading preserves the original file, but Question Studio needs more than a PDF URL. LearnTerms prepares page-aware text, makes it searchable, and builds a reusable topic map before the document is fully ready.

The **Properties** tab shows all four stages.

## Stored

**Stored** means the original PDF is safely available in the Content Library.

At this point you can open the original source. Generation becomes available after readable extraction and indexing.

## Extracted

**Extracted** means LearnTerms has processed the PDF into page-aware text and layout artifacts.

Extraction powers:

* the Markdown preview
* page text in the Question Studio picker
* table and math rendering when the source supports it
* source-page citations

Always compare important pages with the original PDF. Image-only diagrams may be visible in **Source** but absent from extracted text.

## Indexed

**Indexed** means the extracted material is available to the source-retrieval system used during question generation.

Page-based runs require readable extracted and indexed content. If indexing fails, open **Properties**, review the error, and click **Resume processing**.

## Mapped

**Mapped** means LearnTerms has organized the indexed document into reusable topics with page references, summaries, key terms, objectives, and supported question types.

Mapped documents unlock **Topics** mode in Question Studio. Review the selected topics and their page scope before generating.

## Status messages

You may see messages such as:

* **Queued for extraction**
* **Extracting text & tables**
* **Preparing for search**
* **Queued for topic mapping**
* **Mapping topics**
* **Processing needs attention**
* **Topic mapping needs attention**
* **Ready**

The status updates live. Background work continues after you leave the page.

## Recover from a failed stage

1. Open the document.
2. Select **Properties**.
3. Read the processing error and identify the failed stage.
4. Click **Resume processing**.
5. Wait for the stage indicator to update.
6. Recheck **Preview** before generating.

If topic mapping alone fails, a page-based run may still work when extraction and indexing are complete. Switch Question Studio to **Pages** and select a focused range.

## A green check means ready

The green check on a card or list row confirms completion of all four stages. Extraction fidelity still requires comparison between **Preview** and **Source**.

## Related guides

* [Content Library](/docs/admin/content-library)
* [Source context](/docs/admin/source-context)
* [Question Studio](/docs/admin/question-studio)