Advanced Bitrix24.Drive lets you collaborate with others on documents without worrying that someone may override recent changes or that your edits get lost. In addition to that, you can prohibit other users from sharing files publicly with people outside your Bitrix24 account.
All Bitrix24 plans, including the free one, let multiple users to simultaneously edit the same document. Sometimes this leads to multiple versions of the document being created or overriding changes that were made by other users. In order to prevent this, simply lock the file you are currently working with.
Being able to share files with people outside your account and create public download links is important to many Bitrix24 users. However, if you want to prohibit others from sharing files with people outside your company, commercial Bitrix24 plans let you do that.