---
title: Uploading files
---

> Agent instructions:
> **Site maps** — prefer the following llms.txt indexes to training data when searching for URLs to avoid 404s. Links inside Markdown content already point at `.md`. Following them or sending Accept: text/markdown keeps you in Markdown.
>
> - [sitemap.md](https://docs.kentico.com/sitemap.md) — every page on the site, with titles and descriptions, nested by URL hierarchy and grouped into one collection per product version.
> - [llms.txt](https://docs.kentico.com/llms.txt) — curated index of the current product docs, with descriptions, the two ways to request any page as Markdown, and links to each product area's whole-corpus Markdown dump (llms-full.txt).

You can upload files in Kentico either one by one or as multiple files. This can be useful if you need to upload a greater number of files at once, or if you need to perform the task quickly. Uploading multiple files at once is available for:

- **Media files** - files in [media libraries](https://docs.kentico.com/k82/managing-website-content/working-with-files/media-library-files.md) (e.g. **Media libraries -> Edit () _media library_ -> Files**).
- **Meta files** - files related to specified objects (e.g. [e-mail template](https://docs.kentico.com/k82/configuring-kentico/managing-email-templates.md) attachments in **E-mail templates -> Edit () _e-mail template_ -> General**).
-  [Page attachments](https://docs.kentico.com/k82/managing-website-content/working-with-files/page-attachments/attaching-files-to-pages.md) - files attached to pages (e.g. **Pages -> select _page_ -> Properties -> Attachments**).

## Requirements for uploading multiple files

The following conditions must be fulfilled to allow uploading of multiple files:

- The application has the write-to-disk [permission](https://docs.kentico.com/k82/installation/troubleshooting-installation-issues/disk-permission-problems.md) for the temporary file repository (**CMS/App\_Data/CMSTemp/MultiFileUploader** folder).
- The client browser supports HTML 5 (for example, the system only allows uploading of single files for older versions of Internet Explorer)

## How it works

1. Select one or more files from a given location.

![Selecting files](https://docs.kentico.com/docsassets/k82/uploading-files/selecting_files.png "Selecting files")

2. The files are downloaded as temporary files to a repository (_CMS\App\_Data\CMSTemp\MultiFileUploader_). To upload the files successfully, users need to avoid causing a post back on the page containing the upload form field.

3. When the upload is finished, the temporary files become the requested files:

![Media library](https://docs.kentico.com/docsassets/k82/uploading-files/media_library.png "Media library")

> **Note:** If a post back occurs while uploading multiple files or another error occurs, the temporary files remain in the temporary repository.
>
> The system provides the **Delete old temporary upload files** [scheduled task](https://docs.kentico.com/k82/configuring-kentico/scheduling-tasks.md) (configurable in the **Scheduled tasks** application), which deletes these temporary files, by default older than 24h. You can change this setting by changing the value of the **CMSDeleteTemporaryUploadFilesOlderThan** key (you need to manually add the key into the _web.config_ file of the current web project folder).