We've developed enterprise internal document management systems for some companies. Today, let's talk about the functions that an enterprise document management system usually includes: First of all, users are allowed to upload and download files. The file formats can include videos, pictures, documents, or compressed packages. Since different enterprises deal with various file types, but we also need to consider security and can't allow all file formats unrestrictedly. Therefore, this part needs to be configured independently according to the customers' requirements. Secondly, the functions of folders, labels, or categorization within the system need to be customizable. Users can set up this information on their own. It's similar to an operating system, where users can freely create as many folders as they like. Sub - folders can be set up inside each folder, and each folder can have a customized name, tags, and other information. Thirdly, the system can grant authorized users access rights to specific files or folders. Through setting user roles and permission management, multi - dimensional permission management for different areas can be configured. Fourthly, due to the large number of files in the system, a fast and accurate search function is also necessary, enabling users to quickly find the files they need. Here, search can be conducted by combining information such as time, file type, and keywords. Fifthly, users can be allowed to share files, folders, or the entire document library, and multi - person collaborative editing is supported. File sharing and access can also be realized according to the company's project teams or individual employees. In addition to the above functions and details, different companies may have special personalized requirements. Moreover, since many of these document management systems need to be deployed on the enterprise's internal servers, an open - source system is a must.