expo-document-picker is a library that allows users to select documents from their device's file system in Expo applications. It provides a simple and efficient way to access files, enabling developers to build applications that require file uploads or document management. While expo-document-picker is a powerful tool for document selection, there are several alternatives in the React Native ecosystem that offer similar functionality. Here are a few notable alternatives:

• expo-file-system is a library that provides access to the device's file system in Expo applications. While it does not specifically focus on document picking, it allows developers to read, write, and manage files on the device. This library is useful for applications that need to handle file storage and manipulation, making it a good complement to document picking solutions. If your application requires more extensive file management capabilities alongside document picking, expo-file-system can be a valuable addition.
• react-native-document-picker is a popular library for selecting documents in React Native applications. Unlike expo-document-picker, which is tailored for Expo, react-native-document-picker can be used in both Expo and non-Expo projects. It provides a straightforward API for accessing the device's document picker, allowing users to select files from various sources. If you are looking for a more flexible solution that can be integrated into both Expo and bare React Native projects, react-native-document-picker is an excellent choice.
• react-native-fs is a file system library for React Native that enables developers to interact with the device's file system. It provides functionalities for reading, writing, and managing files, similar to expo-file-system. While it does not offer document picking capabilities, it can be used in conjunction with other libraries to handle file operations after a document has been selected. If your application requires low-level file system access and manipulation, react-native-fs is a powerful option.
• react-native-image-picker is a library specifically designed for selecting images and videos from the device's gallery or camera. While its primary focus is on media selection, it can be used alongside document pickers for applications that require both document and media handling. If your application needs to manage images and videos in addition to documents, react-native-image-picker is a great choice.

For a comprehensive comparison of these libraries, check out the link: Comparing expo-document-picker vs expo-file-system vs react-native-document-picker vs react-native-fs vs react-native-image-picker.