Qfile Pro 4+‎

Qfile Pro is a free companion app for QNAP NAS that allows you to browse and manage the files on your NAS using your iPhone or iPad.
Prerequisites:
- iOS 15 or later
- QNAP NAS running QTS 4.0 or later, QuTS hero 4.5.0 or later

Major features of Qfile Pro:
- Access files on your QNAP NAS anytime, anywhere.
- Directly upload photos and documents from your iOS devices to your NAS.
- Easy sharing: Create download links to easily share files via email or SMS, or simply email the file as an attachment.
- Easy management: Move, copy, rename, and delete files on your NAS using your mobile device. No computer required.
- Offline file reading: Download files from your NAS to your iOS device for convenient access when you do not have an Internet connection.
- Auto upload: Automatically upload photos from your device's photo gallery to the NAS. (To ensure that Qfile Pro can continually provide this background service, you must allow the location service - please note that this may noticeably decrease battery life.)
- Qysnc integration: Synchronize files between your mobile device and your QNAP NAS. (Requires QTS 4.3.4/QuTS hero 4.5.0 or later, and Qsync Central to be installed on your QNAP NAS device.)

Other features:
1. Support for displaying files thumbnail.
2. Supports control playback from QNAP NAS to DLNA devices. (requires QNAP Media Server, and QTS 4.0/QuTS hero 4.5.0 or later)
3. Support for file compression. (QTS 4.0/QuTS hero 4.5.0 or later)

Supported Formats:
Photos: BMP, JPG, JPE, PNG, TGA, GIF
Music: MP3, FLAC, OGG, WAV, AIF, AIFF
Videos: AVI, MP4