> ## Documentation Index
> Fetch the complete documentation index at: https://docs.3dpreppro.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Uploading files

> How to get your 3D files into the platform

## Drag and drop

The fastest way to upload is dragging your files directly onto the upload area on the [home dashboard](/models/home-dashboard) or the [My Models](/models/model-library) page. You can also click **Browse** to open a file picker.

## Upload progress

Each file shows a progress bar during upload. You can cancel individual uploads by clicking the X button on the progress card. When uploading multiple files, they process in parallel.

## Archives

Upload **ZIP** or **RAR** archives and we automatically extract them. We find and process the 3D files inside, including any associated texture and material files.

<Tip>
  For OBJ files, the best approach is to ZIP the `.obj` file together with the `.mtl` file and all texture images (`.png`, `.jpg`). This ensures colors and textures are preserved.
</Tip>

## Special file types

### Medical imaging (DICOM)

When you upload DICOM files (`.dcm`), a configuration dialog appears after upload.

<Frame>
  <img src="https://mintcdn.com/alphaworks/ovWnUpkEFn4EqZKR/images/models/dicom-modal.png?fit=max&auto=format&n=ovWnUpkEFn4EqZKR&q=85&s=baa8e0bb3eb4baf8bb966c26a5f4caac" alt="DICOM configuration dialog with segmentation presets" width="1732" height="1426" data-path="images/models/dicom-modal.png" />
</Frame>

You can configure:

* **Segmentation preset** — Choose from Standard, Head, Simple, or Dense Only
* **Segment definitions** — Add or remove body segments with custom names, colors, and per-segment density ranges (Hounsfield Unit min/max)

Click **Start Analysis** to begin converting the DICOM data into a 3D mesh.

<Warning>
  Maximum file size is **8 million polygons** per upload. For larger models, reduce the polygon count in your modeling software before uploading.
</Warning>