# 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. --- # Agent Instructions: 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: ``` GET https://kb.moomoo.agency/uni-cpo-4-documentation/usage/options/file-upload.md?ask= ``` The question should be specific, self-contained, and written in natural language. 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.