It's not work!

[xuzhipeng]

<?xml version="1.0" encoding="utf-8"?>
<package xmlns="http://schemas.microsoft.com/packaging/2012/06/nuspec.xsd">
<metadata>
<id>My.Test.Logging</id>
<version>0.1.0-alpha201610171645</version>
<authors>me</authors>
<owners>My</owners>
<projectUrl</projectUrl>
<iconUrl></iconUrl>
<requireLicenseAcceptance>false</requireLicenseAcceptance>
<description>Log Interface</description>
<language>zh-Hans</language>
<dependencies>
<group targetFramework=".NETFramework4.0" />
<group targetFramework=".NETStandard1.0" />
<group targetFramework=".NETPortable4.5-net45+win8" />
<group targetFramework="MonoAndroid1.0" />
<group targetFramework="Xamarin.iOS1.0" />
</dependencies>
</metadata>
<files>
<file src="lib\net40\UT.Core.Logging.dll" target="lib\net40\UT.Core.Logging.dll" />
<file src="lib\net40\UT.Core.Logging.XML" target="lib\net40\UT.Core.Logging.XML" />
<file src="lib\netstandard1.0\UT.Core.Logging.dll" target="lib\netstandard1.0\UT.Core.Logging.dll" />
<file src="lib\netstandard1.0\UT.Core.Logging.XML" target="lib\netstandard1.0\UT.Core.Logging.XML" />
<file src="lib\portable-net45+win8+MonoAndroid10+Xamarin.iOS10\UT.Core.Logging.dll" target="lib\portable-net45+win8\UT.Core.Logging.dll" />
<file src="lib\portable-net45+win8+MonoAndroid10+Xamarin.iOS10\UT.Core.Logging.XML" target="lib\portable-net45+win8\UT.Core.Logging.XML" />
</files>
</package>

1.this is my nuspec file,when I pack it, then upload to ProGet, it's can't be find in NuGet in Visual Studio 2015, type include MonoAndroid, Xamarin.iOS and netstandard, but if I publish the same nupkg in a nuget.org, it work.

2.with my many times trying......en,I change the nuspec let 'portable-net45+win8' to 'portable-net45+win8+MonoAndroid10+Xamarin.iOS10', it's finally can find in MonoAndroid Class Library and Xamarin.iOS Class Library project, but it always can't find in netstandard project by ProGet, why ?Am I go the wrong way ?

Product: ProGet
Version: 4.4.2