Fix

Author: SebastianStehle

sample/Sample.Android/Resources/Resource.designer.cs

@@ -14,7 +14,7 @@
     <AssemblyName>Sample.iOS</AssemblyName>
     <MtouchEnableSGenConc>true</MtouchEnableSGenConc>
     <MtouchHttpClientHandler>NSUrlSessionHandler</MtouchHttpClientHandler>
-    <ProvisioningType>automatic</ProvisioningType>
+    <ProvisioningType>manual</ProvisioningType>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|iPhoneSimulator' ">
@@ -47,12 +47,12 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <MtouchArch>ARM64</MtouchArch>
-    <CodesignKey>Apple Development: Sebastian Stehle (QXSQNQVQ76)</CodesignKey>
+    <CodesignKey>iPhone Developer</CodesignKey>
     <MtouchDebug>true</MtouchDebug>
     <CodesignEntitlements>Entitlements.plist</CodesignEntitlements>
     <MtouchLink>None</MtouchLink>
     <MtouchInterpreter>-all</MtouchInterpreter>
-    <CodesignProvision>VS: io.notifo.xamarin.sample Development</CodesignProvision>
+    <CodesignProvision></CodesignProvision>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|iPhone' ">
     <DebugType>none</DebugType>

sample/Sample.iOS/Sample.iOS.csproj

@@ -239,7 +239,7 @@ private async Task AddImageAsync(UNMutableNotificationContent content, UserNotif
                 return;
             }
 
-            var attachmentName = Guid.NewGuid().ToString();
+            var attachmentName = $"{Guid.NewGuid()}.png";
             var attachmentUrl = new NSUrl(attachmentName, NSFileManager.DefaultManager.GetTemporaryDirectory());
 
             // The cache directory cannot be used.