You're looking for information on WebDAV server apps for Android, specifically the "WebDAV Server Pro" APK. Here's what I found:

WebDAV Server Pro is a popular Android app that turns your device into a WebDAV server, allowing you to access and manage your device's files remotely over the internet or local network. WebDAV (Web Distributed Authoring and Versioning) is a protocol that enables users to collaborate and share files over the web.

When downloading APKs from third-party sources, ensure you have adequate antivirus protection and exercise caution to avoid malware.