I have an external USB SSD install with Windows 10.
Open the Disk Utility app. Select the USB drive and click the Erase button. Choose the Name as Untitled, Format as OS X Extended (Journaled) and select Scheme as GUID Partition Map. This option is used for all Intel-based Mac computers. Click Erase, then click Done. Smart Disk Mounter is the app which the smart phone can be used as Wireless USB disk at the computer. Smart mobile phones can be used as a wireless hard drive in PC Windows and Mac OS-X. It is designed that the smartphone can do same operation with general USB memory disk or Wi-Fi wireless disk device. It doesn't use any USB cable, USB memory, memory card, web browsers or the general FTP programs. Apr 18, 2019 Leverage Disk Utility on macOS to encrypt USB drives As we covered, if you don’t see the Encrypt option, it means that your USB device hasn’t been formatted with a GUID partition map — which is a requirement for Finder encryption. To get the encryption option, you’ll need to erase your thumb drive and then encrypt it in Disk Utility.
On my MacBook Pro 15' mid 2014 I can press option on boot and it will show up and I can boot to Windows.

However when I try on my MacBook Air 13' early 2015, pressing option on boot doesn't show up the external USB SSD, only macOS partition is shown. When I boot in to macOS, I can view the external USB thus the USB port is not faulty, I also try again on my MacBook Pro and its able to boot up to Windows with no problem
How to access it on my MacBook Air? I tried on both USB ports doesn't work.
The only different is on my MacBook Air I turn on FileVault which is require by my company while the MacBook Pro don't as I use at home.

Any help is appreciated. Thanks in advance.
MacBook Air, Mac OS X (10.7.5)
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Apple T2 chip.
The next generation of security.
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Apps need your permission to access files in your Documents, Downloads, and Desktop folders as well as in iCloud Drive and external volumes. And you’ll be prompted before any app can access the camera or mic, capture keyboard activity, or take a photo or video of your screen.
FileVault 2 encrypts your data.
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The Find My app combines Find My iPhone and Find My Friends into a single, easy-to-use app on Mac, iPad, and iPhone. Find My can help you locate a missing Mac — even if it’s offline or sleeping — by sending out Bluetooth signals that can be detected by nearby Apple devices. These devices then relay the detected location of your Mac to iCloud so you can locate it in the Find My app. It’s all anonymous and encrypted end-to-end so no one — including Apple — knows the identity of any reporting device or the location of your Mac. And it all happens silently using tiny bits of data that piggyback on existing network traffic. So there’s no need to worry about your battery life, your data usage, or your privacy being compromised.
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Keep your Mac safe.
Even if it’s in the wrong hands.
All Mac models with the Apple T2 Security Chip support Activation Lock — just like your iPhone or iPad. So if your Mac is ever misplaced or lost, the only person who can erase and reactivate it is you.
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