diff --git a/.github/workflows/Publish-Nuget.yml b/.github/workflows/Publish-Nuget.yml
index b4b1753..97d7f43 100644
--- a/.github/workflows/Publish-Nuget.yml
+++ b/.github/workflows/Publish-Nuget.yml
@@ -11,57 +11,90 @@ on:
       - '*'
     paths:
       - ElevenLabs-DotNet/**
+    types:
+      - opened
+      - synchronize
 
   workflow_dispatch:
+    inputs:
+      dotnet-version:
+        description: ".NET version to use"
+        required: false
+        default: "6.0.x"
+
+env:
+  DOTNET_VERSION: ${{ github.event.inputs.dotnet-version || '6.0.x' }}
 
 jobs:
   build:
-    strategy:
-      matrix:
-        configuration: [Release]
-
+    if: ${{ !github.event_name == 'pull_request' || !github.event.pull_request.draft }}
     runs-on: windows-latest
 
     steps:
     - uses: actions/checkout@v3
       with:
         fetch-depth: 0
-
     - uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: '6.0.x'
-
+        dotnet-version: ${{ env.DOTNET_VERSION }}
     - uses: microsoft/setup-msbuild@v1
 
-    - name: Test Package ${{ matrix.configuration }}
-      run: dotnet test --configuration ${{ matrix.configuration }}
+    - name: Test Packages
+      run: dotnet test --configuration Release
+      if: ${{ github.ref != 'refs/heads/main' && github.event_name != 'push' }}
       env:
         ELEVEN_LABS_API_KEY: ${{ secrets.ELEVEN_LABS_API_KEY }}
 
-    - name: Publish Nuget Package
+    - name: Build Pack and Publish NuGet Package
       run: |
-        $out = "${{ github.workspace }}\ElevenLabs-DotNet\bin\${{ matrix.configuration }}"
+        $projectPath = "${{ github.workspace }}\ElevenLabs-DotNet"
+        #$proxyProjectPath = "${{ github.workspace }}\ElevenLabs-DotNet-Proxy"
 
-        if (Test-Path -Path $out) {
-          $packagePath = Get-ChildItem -Path $out -File -Include '*.nupkg' -Recurse
-        }
+        # build all
+        dotnet build --configuration Release
 
-        if (Test-Path -Path $packagePath) {
+        # pack ElevenLabs-DotNet
+        dotnet pack $projectPath --configuration Release --include-symbols
+        $out = "$projectPath\bin\Release"
+        $packagePath = Get-ChildItem -Path $out -File -Include '*.nupkg' -Exclude '*symbols*' -Recurse -ErrorAction SilentlyContinue
+
+        if ($packagePath) {
           Write-Host Package path: $packagePath
         } else {
-          Write-Host Failed to find package at $packagePath
+          Write-Host Failed to find package at $out
           exit 1
         }
 
-        $isRelease = "${{ github.ref == 'refs/heads/main' && matrix.configuration == 'Release' }}"
+        # pack ElevenLabs-DotNet-Proxy
+        #dotnet pack $proxyProjectPath --configuration Release --include-symbols
+        #$proxyOut = "$proxyProjectPath\bin\Release"
+        #$proxyPackagePath = Get-ChildItem -Path $proxyOut -File -Include '*.nupkg' -Exclude '*symbols*' -Recurse -ErrorAction SilentlyContinue
+
+        #if ($proxyPackagePath) {
+        #  Write-Host Package path: $proxyPackagePath
+        #} else {
+        #  Write-Host Failed to find package at $proxyOut
+        #  exit 1
+        #}
+
+        $isRelease = "${{ github.ref == 'refs/heads/main' }}"
 
         if ($isRelease -eq 'true') {
-          dotnet nuget push $packagePath --api-key ${{ secrets.NUGET_API_KEY }} --source https://api.nuget.org/v3/index.json
+          dotnet nuget push $packagePath.FullName --api-key ${{ secrets.NUGET_API_KEY }} --source https://api.nuget.org/v3/index.json --skip-duplicate
+          #dotnet nuget push $proxyPackagePath.FullName --api-key ${{ secrets.NUGET_API_KEY }} --source https://api.nuget.org/v3/index.json --skip-duplicate
         }
+
+        $version = $packagePath.Name -replace "^ElevenLabs-DotNet.(.*).nupkg$",'$1'
+        echo "PACKAGE_VERSION=$version" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
       shell: pwsh
 
     - uses: actions/upload-artifact@v3
       if: always()
       with:
-        name: Nuget Package ${{ matrix.configuration }}
-        path: ${{ github.workspace }}\ElevenLabs-DotNet\bin
+        name: ElevenLabs-DotNet.${{ env.PACKAGE_VERSION }}
+        path: |
+          ${{ github.workspace }}/ElevenLabs-DotNet/bin/Release/ElevenLabs-DotNet.${{ env.PACKAGE_VERSION }}.nupkg
+          ${{ github.workspace }}/ElevenLabs-DotNet/bin/Release/ElevenLabs-DotNet.${{ env.PACKAGE_VERSION }}.symbols.nupkg
+          #${{ github.workspace }}/ElevenLabs-DotNet/bin/Release/ElevenLabs-DotNet-Proxy.${{ env.PACKAGE_VERSION }}.nupkg
+          #${{ github.workspace }}/ElevenLabs-DotNet/bin/Release/ElevenLabs-DotNet-Proxy.${{ env.PACKAGE_VERSION }}.symbols.nupkg
+        if-no-files-found: ignore
diff --git a/ElevenLabs-DotNet-Tests/ElevenLabs-DotNet-Tests.csproj b/ElevenLabs-DotNet-Tests/ElevenLabs-DotNet-Tests.csproj
index 2d83891..8128d46 100644
--- a/ElevenLabs-DotNet-Tests/ElevenLabs-DotNet-Tests.csproj
+++ b/ElevenLabs-DotNet-Tests/ElevenLabs-DotNet-Tests.csproj
@@ -1,24 +1,23 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>net6.0</TargetFramework>
     <RootNamespace>ElevenLabs</RootNamespace>
     <ImplicitUsings>disable</ImplicitUsings>
-    <Nullable>enable</Nullable>
-
+    <Nullable>disable</Nullable>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
-
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
     <PackageReference Include="NUnit" Version="3.13.3" />
-    <PackageReference Include="NUnit3TestAdapter" Version="4.2.1" />
-    <PackageReference Include="NUnit.Analyzers" Version="3.3.0" />
-    <PackageReference Include="coverlet.collector" Version="3.1.2" />
-  </ItemGroup>
-
-  <ItemGroup>
+    <PackageReference Include="NUnit3TestAdapter" Version="4.4.2" />
+    <PackageReference Include="NUnit.Analyzers" Version="3.6.1">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="coverlet.collector" Version="3.2.0">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
     <ProjectReference Include="..\ElevenLabs-DotNet\ElevenLabs-DotNet.csproj" />
   </ItemGroup>
-
 </Project>
diff --git a/ElevenLabs-DotNet-Tests/Test_Fixture_04_TextToSpeechEndpoint.cs b/ElevenLabs-DotNet-Tests/Test_Fixture_03_TextToSpeechEndpoint.cs
similarity index 94%
rename from ElevenLabs-DotNet-Tests/Test_Fixture_04_TextToSpeechEndpoint.cs
rename to ElevenLabs-DotNet-Tests/Test_Fixture_03_TextToSpeechEndpoint.cs
index 5c6e3cf..fc006f6 100644
--- a/ElevenLabs-DotNet-Tests/Test_Fixture_04_TextToSpeechEndpoint.cs
+++ b/ElevenLabs-DotNet-Tests/Test_Fixture_03_TextToSpeechEndpoint.cs
@@ -7,7 +7,7 @@
 
 namespace ElevenLabs.Voice.Tests
 {
-    internal class Test_Fixture_04_TextToSpeechEndpoint
+    internal class Test_Fixture_03_TextToSpeechEndpoint
     {
         [Test]
         public async Task Test_01_TextToSpeech()
diff --git a/ElevenLabs-DotNet-Tests/Test_Fixture_03_HistoryEndpoint.cs b/ElevenLabs-DotNet-Tests/Test_Fixture_04_HistoryEndpoint.cs
similarity index 94%
rename from ElevenLabs-DotNet-Tests/Test_Fixture_03_HistoryEndpoint.cs
rename to ElevenLabs-DotNet-Tests/Test_Fixture_04_HistoryEndpoint.cs
index dd27990..398b540 100644
--- a/ElevenLabs-DotNet-Tests/Test_Fixture_03_HistoryEndpoint.cs
+++ b/ElevenLabs-DotNet-Tests/Test_Fixture_04_HistoryEndpoint.cs
@@ -8,7 +8,7 @@
 
 namespace ElevenLabs.Voice.Tests
 {
-    internal class Test_Fixture_03_HistoryEndpoint
+    internal class Test_Fixture_04_HistoryEndpoint
     {
         [Test]
         public async Task Test_01_GetHistory()
@@ -66,7 +66,7 @@ public async Task Test_04_DeleteHistoryItem()
             var historyItems = await api.HistoryEndpoint.GetHistoryAsync();
             Assert.NotNull(historyItems);
             Assert.IsNotEmpty(historyItems);
-            var itemToDelete = historyItems.MinBy(item => item.Date);
+            var itemToDelete = historyItems.FirstOrDefault(item => item.Text.Contains("The quick brown fox jumps over the lazy dog."));
             Assert.NotNull(itemToDelete);
             Console.WriteLine($"Deleting {itemToDelete!.Id}...");
             var result = await api.HistoryEndpoint.DeleteHistoryItemAsync(itemToDelete);
diff --git a/ElevenLabs-DotNet/ElevenLabs-DotNet.csproj b/ElevenLabs-DotNet/ElevenLabs-DotNet.csproj
index 74216cf..8e772d0 100644
--- a/ElevenLabs-DotNet/ElevenLabs-DotNet.csproj
+++ b/ElevenLabs-DotNet/ElevenLabs-DotNet.csproj
@@ -1,5 +1,4 @@
 <Project Sdk="Microsoft.NET.Sdk">
-
   <PropertyGroup>
     <TargetFramework>net6.0</TargetFramework>
     <LangVersion>latest</LangVersion>
@@ -13,10 +12,13 @@
     <Authors>Stephen Hodgson</Authors>
     <Title>ElevenLabs-DotNet</Title>
     <Company>RageAgainstThePixel</Company>
-    <Version>1.0.3</Version>
+    <Version>1.0.4</Version>
     <Copyright>2023</Copyright>
     <PackageTags>ElevenLabs, AI, ML, Voice, TTS</PackageTags>
-    <PackageReleaseNotes>Release 1.0.3
+    <PackageReleaseNotes>Release 1.0.4
+- Updated docs
+- Removed exception when sample item path is null or whitespace
+Release 1.0.3
 - Updated DownloadHistoryItemsAsync to download all items if no ids are specified
 - Updated docs
 Release 1.0.2
@@ -32,16 +34,8 @@ Release 1.0.0
 I am not affiliated with Eleven Labs and an account with api access is required.
 All copyrights, trademarks, logos, and assets are the property of their respective owners.</Description>
     <PackageIcon>ElevenLabsIcon.png</PackageIcon>
-  </PropertyGroup>
-
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
-    <TreatWarningsAsErrors>True</TreatWarningsAsErrors>
-  </PropertyGroup>
-
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
     <TreatWarningsAsErrors>True</TreatWarningsAsErrors>
   </PropertyGroup>
-
   <ItemGroup>
     <None Include="Assets\ElevenLabsIcon.png">
       <Pack>True</Pack>
@@ -56,5 +50,4 @@ All copyrights, trademarks, logos, and assets are the property of their respecti
       <PackagePath>\</PackagePath>
     </None>
   </ItemGroup>
-
 </Project>
diff --git a/ElevenLabs-DotNet/Voices/VoicesEndpoint.cs b/ElevenLabs-DotNet/Voices/VoicesEndpoint.cs
index 5aa2d76..8e49870 100644
--- a/ElevenLabs-DotNet/Voices/VoicesEndpoint.cs
+++ b/ElevenLabs-DotNet/Voices/VoicesEndpoint.cs
@@ -144,7 +144,7 @@ public async Task<Voice> AddVoiceAsync(string name, IEnumerable<string> samplePa
                     {
                         if (string.IsNullOrWhiteSpace(sample))
                         {
-                            throw new ArgumentNullException(nameof(sample));
+                            continue;
                         }
 
                         var fileStream = File.OpenRead(sample);
@@ -198,7 +198,7 @@ public async Task<bool> EditVoiceAsync(Voice voice, IEnumerable<string> samplePa
                     {
                         if (string.IsNullOrWhiteSpace(sample))
                         {
-                            throw new ArgumentNullException(nameof(sample));
+                            continue;
                         }
 
                         var fileStream = File.OpenRead(sample);
diff --git a/README.md b/README.md
index 8b2b510..c12f0b2 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,7 @@ Install-Package ElevenLabs-DotNet
 
 ### Table of Contents
 
+- [Authentication](#authentication)
 - [Text to Speech](#text-to-speech)
 - [Voices](#voices)
   - [Get All Voices](#get-all-voices)
@@ -51,6 +52,56 @@ Install-Package ElevenLabs-DotNet
   - [Get User Info](#get-user-info)
   - [Get Subscription Info](#get-subscription-info)
 
+### Authentication
+
+There are 3 ways to provide your API keys, in order of precedence:
+
+1. [Pass keys directly with constructor](#pass-keys-directly-with-constructor)
+2. [Load key from configuration file](#load-key-from-configuration-file)
+3. [Use System Environment Variables](#use-system-environment-variables)
+
+#### Pass keys directly with constructor
+
+```csharp
+var api = new ElevenLabsClient("yourApiKey");
+```
+
+Or create a `ElevenLabsAuthentication` object manually
+
+```csharp
+var api = new ElevenLabsClient(new ElevenLabsAuthentication("yourApiKey"));
+```
+
+#### Load key from configuration file
+
+Attempts to load api keys from a configuration file, by default `.elevenlabs` in the current directory, optionally traversing up the directory tree or in the user's home directory.
+
+To create a configuration file, create a new text file named `.elevenlabs` and containing the line:
+
+##### Json format
+
+```json
+{
+  "apiKey": "yourApiKey",
+}
+```
+
+You can also load the file directly with known path by calling a static method in Authentication:
+
+```csharp
+var api = new ElevenLabsClient(ElevenLabsAuthentication.LoadFromDirectory("your/path/to/.elevenlabs"));;
+```
+
+#### Use System Environment Variables
+
+Use your system's environment variables specify an api key to use.
+
+- Use `ELEVEN_LABS_API_KEY` for your api key.
+
+```csharp
+var api = new ElevenLabsClient(ElevenLabsAuthentication.LoadFromEnv());
+```
+
 ### [Text to Speech](https://api.elevenlabs.io/docs#/text-to-speech)
 
 Convert text to speech.