I use the codes to take photo and save it.
private async void btnCamera_Clicked(object sender, EventArgs e)
var photo = await CrossMedia.Current.TakePhotoAsync(
new StoreCameraMediaOptions
SaveToAlbum = true
But error, vs2022 tell that
System.ArgumentException: 'Unable to get file location. This most likely means that the file provider information is not set in your Android Manifest file. Please check documentation on how to set this up in your project.'

I have add the info to AndroidManifest.xml, but error too.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.companyname.cartooncamera">
<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="30" />
<application android:label="CartoonCamera.Android" android:theme=" @STYLE /MainTheme"></application>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA" />
</manifest>

But error, vs2022 tell that
System.ArgumentException: 'Unable to get file location. This most likely means that the file provider information is not set in your Android Manifest file. Please check >documentation on how to set this up in your project.'

I have add the info to AndroidManifest.xml, but error too.

No, you did not add <provider> tag like following format to the AndroidManifest.xml.

   <?xml version="1.0" encoding="utf-8"?>  
   <manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.companyname.startactivitydemo11">  
       <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="30" />  
       <application android:label="StartActivityDemo11.Android" android:theme="@style/MainTheme">  
      <!--add this part-->  
         <provider android:name="androidx.core.content.FileProvider"  
              android:authorities="${applicationId}.fileprovider"  
              android:exported="false"  
              android:grantUriPermissions="true">  
           <meta-data android:name="android.support.FILE_PROVIDER_PATHS"  
                            android:resource="@xml/file_paths"></meta-data>  
         </provider>  
       </application>  
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />  
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />  
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />  
     <uses-permission android:name="android.permission.CAMERA" />  
   </manifest>  
Here are steps to add the <provider> tag.
If you target framework set Android 10 or later.
1 (AndroidX) Add the following to your AndroidManifest.xml inside the <application> tags:
   <provider android:name="androidx.core.content.FileProvider"   
             android:authorities="${applicationId}.fileprovider"   
             android:exported="false"   
             android:grantUriPermissions="true">  
      <meta-data android:name="android.support.FILE_PROVIDER_PATHS"   
                        android:resource="@xml/file_paths"></meta-data>  
   </provider>  
2 Add a new folder called xml into your Resources folder and add a new XML file called file_paths.xml. Make sure that this XML file has a Build Action of: AndroidResource.
3 Add the following code to file_paths.xml:
   <?xml version="1.0" encoding="utf-8" ?>  
     <paths xmlns:android="http://schemas.android.com/apk/res/android">  
       <external-files-path name="my_images" path="Pictures" />  
       <external-files-path name="my_movies" path="Movies" />  
     </paths>  
If you target framework blew Android 10 .
(Non AndroidX) Add the following to your AndroidManifest.xml inside the <application> tags: Other steps is the same as above AndroidX
   <provider android:name="android.support.v4.content.FileProvider"   
             android:authorities="${applicationId}.fileprovider"   
             android:exported="false"   
             android:grantUriPermissions="true">  
      <meta-data android:name="android.support.FILE_PROVIDER_PATHS"   
                        android:resource="@xml/file_paths"></meta-data>  
   </provider>  
You can read more at: https://developer.android.com/training/camera/photobasics.html
Best Regards,
Leon Lu
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If you want to save image your Album, due to the android 11's limitation, we have to access the MANAGE_EXTERNAL_STORAGE permission, when I start the application, I use Snackbar to guide users to grand the permission(click the red settings). to grand the permission    
Then I use code to copy the image to Album. and use fileUpdate method to notify the android system to update the Album, when you choose the image from Album, you can see the image.    
						
I use android 10 api 29.  

I have add MANAGE_EXTERNAL_STORAGE  to file.  

I do not find the image by camera take at album.  

How to use fileUpdate?  
												
If you want to support Android 11 in future, you can add if stance to judege it.  
if (Android.OS.Build.VERSION.SdkInt >= BuildVersionCodes.R)
                if (!Android.OS.Environment.IsExternalStorageManager)
                    Snackbar.Make(FindViewById(Android.Resource.Id.Content), "Permission needed!", Snackbar.LengthIndefinite)
                            .SetAction("Settings", new MyOnClickListener(this)).Show();
						
<?xml version="1.0" encoding="utf-8"?>    

<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.companyname.cartooncamera">    

    <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="30" />  

    <application android:label="CartoonCamera.Android" android:theme="@STYLE  /MainTheme">  

      <provider android:name="androidx.core.content.FileProvider"  

           android:authorities="${applicationId}.fileprovider"  

           android:exported="false"  

           android:grantUriPermissions="true">  

        <meta-data android:name="android.support.FILE_PROVIDER_PATHS"  

                         android:resource="@XML  /file_paths"></meta-data>  

      </provider>        

    </application>  

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />  

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />  

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />  

    <uses-permission android:name="android.permission.CAMERA" />  

    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE " />  

</manifest>