> For the complete documentation index, see [llms.txt](https://docs.heisenware.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.heisenware.com/~/changes/Q625pQNc0nXqVGPtyjAY/building-apps/data-and-file-storage/file-server.md).
# File server
Resources are extra files you can add to your app, like custom images or tables. They help enhance an app's functionality and appearance. The most common use case is adding images as extra resources.
## Uploading resources
To make a resource usable in the App Builder, follow these steps:
1. Click on the upload icon of the file manager.
Upload icon
2. Drag and drop a file into the upload field or click in the field and choose a file from your computer's file system.
3. Click `Upload`.
The file will now appear in the uploads section of the file manager and is ready to be used.
## Managing resources
To manage resources:
1. Right-click on the resource you want to manage or delete to open a context menu.
Resource context menu
2. Click on the corresponding menu item.
{% hint style="warning" %}
Be careful renaming or deleting a resource that is already in use. Problems might occur.
{% endhint %}
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://docs.heisenware.com/~/changes/Q625pQNc0nXqVGPtyjAY/building-apps/data-and-file-storage/file-server.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.
