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

# Upload and organize Sources

> Add files or web pages to Sources, arrange them in folders, and keep Project knowledge organized.

Open the relevant Personal, Project, or Workspace Sources area, then add a file or paste a web address. You can drag files into the upload area or choose them from your device.

## Add a file

Athena accepts these file types:

* Text and documents: `.txt`, `.md`, `.doc`, `.docx`, `.pdf`
* Spreadsheets: `.csv`, `.xls`, `.xlsx`
* Images: `.jpg`, `.jpeg`, `.png`

Document and spreadsheet files can be up to **50 MB**. Image files can be up to **3.75 MB**.

If a file is rejected, check both its extension and its actual file type. Renaming an unsupported file does not make it a supported Source.

## Add a web page

Paste a complete web address, such as:

```text theme={null}
https://example.com/research
```

Athena saves the URL as a Source and attempts to read its content. If the page cannot be read, the Source remains visible with an error so you can verify the address and try again.

## Use folders

Create folders to group related Sources. Folders can contain Sources and other folders, so you can organize material by topic, Project phase, client, or date.

You can:

* Create folders and subfolders
* Rename folders
* Move Sources between folders
* Move folders within the folder tree
* Leave Sources at the top level when a folder is not needed

Folders organize Sources; they do not change who can access them. A Source keeps the scope of the Sources area where it was added.

## Delete a Source or folder

Deleting a Source removes it from that Source location. This cannot be undone, so confirm that you no longer need the material before deleting it.

Deleting a folder does not delete the Sources inside it. Its Sources and subfolders move up to the folder's parent level. You can then leave them there or organize them again.

## After you make changes

New uploads, URL additions, and removals may take a little time to appear in Athena's searchable knowledge. See [What gets indexed](/sources/what-gets-indexed) before relying on a newly added Source in a conversation.