# SureDrop File Processing

Within a security group you can store files and have many levels of folders and sub-folders. 

Each security group uses a unique group key as the root of trust to encrypt the stored files. Files can be cut, copied and pasted in any folder within a security group but not between security groups as they use different root encryption keys.

The functions associated with document content are as follows:

* Importing files into groups 
* Downloading files from groups
* Downloading files as a zip files
* Editing files
* Deleting files

SureDrop files can be held either on-premise or in the cloud. Files are encrypted using AES 256-bit keys and held in a fragmented form (as 'shards') to ensure that the content is completely protected.

As a user of SureDrop you have access to facilities that allow you to do the following:

* File importing - SureDrop allows you to import individual files or the content of folders from your external systems to a defined set of folders within the storage system.
* File editing - the file editing facilities provided by SureDrop allow the editing of files held within the encrypted data store.
* File downloading - SureDrop allows you to download files from a document group to a location that exists on the user’s computing system.

## File sizes

SureDrop does not impose a limit on the size of the file you can upload and share. 

Larger files (less than 100Mb) are broken into 10Mb 'chunks' which are downloaded and automatically re-assembled to create the file. Files larger than 100Mb, are divided into 100Mb chunks.

The **Upload Queue** shows each of the chunks so that you can monitor the progress.

 ![](https://assets.suredrop.io/SureDrop-UserDocs-Images/SEN-SureDrop-File-FileUploadQueue.png)

## File Sanitization

[Sanitization](/doc/sanitization-settings-ka3jn0stww) is an optional SureDrop feature which, when enabled, provides automatic file content disarm and reconstruction (CDR) using the Votiro disarmer. CDR can be enabled and disabled by the administrator and access to a licensed Votiro disarmer is required.

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**Documents**

- [Latest SureDrop Enhancements](https://outline.suredrop.io/s/c3c86a1c-0f2a-4dd2-8686-4b8aabd2629a/doc/latest-suredrop-enhancements-kcwScILzAM)
- [SureDrop Mobile App](https://outline.suredrop.io/s/c3c86a1c-0f2a-4dd2-8686-4b8aabd2629a/doc/suredrop-mobile-app-PrQIsDuSKI)
- [Accessing SureDrop](https://outline.suredrop.io/s/c3c86a1c-0f2a-4dd2-8686-4b8aabd2629a/doc/accessing-suredrop-DyN9aMpI70)
- [Interface Languages](https://outline.suredrop.io/s/c3c86a1c-0f2a-4dd2-8686-4b8aabd2629a/doc/interface-languages-hVBopxYENt)
- [SureDrop Dashboard](https://outline.suredrop.io/s/c3c86a1c-0f2a-4dd2-8686-4b8aabd2629a/doc/suredrop-dashboard-fTaQnSgtwV)
- [SureDrop Users](https://outline.suredrop.io/s/c3c86a1c-0f2a-4dd2-8686-4b8aabd2629a/doc/suredrop-users-2ZPUhuPlKk)
- [SureDrop Groups](https://outline.suredrop.io/s/c3c86a1c-0f2a-4dd2-8686-4b8aabd2629a/doc/suredrop-groups-OjqflZoTmQ)
- [SureDrop Properties Sidebar](https://outline.suredrop.io/s/c3c86a1c-0f2a-4dd2-8686-4b8aabd2629a/doc/suredrop-properties-sidebar-tjOboaysYS)
- [SureDrop File Processing](https://outline.suredrop.io/s/c3c86a1c-0f2a-4dd2-8686-4b8aabd2629a/doc/suredrop-file-processing-SSwfY7qTPa)
- [SureDrop Administration](https://outline.suredrop.io/s/c3c86a1c-0f2a-4dd2-8686-4b8aabd2629a/doc/suredrop-administration-Idd3si2zZ3)
- [SureDrop Help and Support](https://outline.suredrop.io/s/c3c86a1c-0f2a-4dd2-8686-4b8aabd2629a/doc/suredrop-help-and-support-q3sCkieDW1)