Qsirch

Qsirch helps you quickly find the files you need. You can perform full-text search to locate files on the QNAP NAS and then further browse and share the files. Free yet powerful, Qsirch is your best search tool.
Requirements:
- iOS 9 or later versions
- QNAP NAS running QTS 4.2 or later versions
Major features:
- Search for the files on one or multiple NAS devices
- Support full-text search for over 6000 file formats
- Provide more than 30 kinds of filter conditions, such as date modified, file path, and file metadata
- Switch between two file preview modes
- Create download links for shared files or folders, allowing you to share files via email, text messages, or instant messengers.