launchd – IOKit appears to not notify after I join a USB gadget

I am at the moment attempting to do a small script that pulls some information from my Android telephone to a folder in my Mac, type of an automated backup.

The script is working completely. The .plist file can be okey after I use WatchPaths, and it detects USB exhausting drives. Nevertheless, since Mac OS would not detect an Android Telephone as a Quantity, even with File Switch on.

I’ve then tried with:

<key>LaunchEvents</key>
    <dict>
        <key>com.apple.iokit.matching</key>
        <dict>
            <key>com.apple.device-attach</key>
            <dict>
                <key>IOProviderClass</key>
                <string>IOUSBHostDevice</string>
                <key>IOMatchLaunchStream</key>
                <true/>
                <key>IOMatchStream</key>
                <true/>
            </dict>
        </dict>
    </dict>

But it surely nonetheless would not work.
As properly with this:

    <key>IOServiceMatch</key>
    <dict>
        <key>Class</key>          <string>IOUSBDevice</string>
    </dict>

Does not work both.
Any concept why it might be? One thing associated with IOKit? I do not know about the way it works or if I ought to configure one thing else.