> For the complete documentation index, see [llms.txt](https://kb.moomoo.agency/uni-cpo-4-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kb.moomoo.agency/uni-cpo-4-documentation/usage/options/file-upload.md).

# File Upload

Adds a possibility to upload files in order to add them to the ordering item. This Option uploads a file via AJAX in chunks, so it can handle file upload of any sizes regardless

```
max_file_upload
```

setting on your hosting. 💪 It is possible to restrict files by size and by MIME types.

Some settings related to this Option are on [plugin's settings](/uni-cpo-4-documentation/usage/plugins-settings.md) page. These settings are global and automatically applied to all instances of File Upload Option. However, setting like *max file size* and \_mime types allowed \_can be overridden on per Option instance basis. It means that you can have fine tuned file uploads across the site! 😎

🏆 **PRO FUNCTIONALITY**: In addition to the main variable that holds an ID of attachment uploaded, this Option also has these special vars:

```
{option_slug_width}
{option_slug_height}
```

**These special variables are not empty only when the image is uploaded!** Images in .png, .jpg formats etc. Obviously, these variables hold values of image's width and height (in pixels) respectively and can be used in backend in maths formula used for the price calculation.


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