Bug System.IO.File doesn't work properly on WebGL platform

I'm trying to save player's data on WebGL platform but File.WriteAllBytes and File.WriteAllText works only in Awake any further calls just doesn't work and there's no exceptions in console. Everything works perfectly on other platforms (Editor, desktop mono, desktop il2cpp, android mono, android il2cpp, etc). I'm missing something?

Unity version: 2022.1.7f1

Code (CSharp):

1.  
2. // Test code
3. public class Tester : MonoBehaviour
4. {
5.     private void Awake()
6.     {
7.          // Works
8.         File.WriteAllText(Path.Combine(Application.persistentDataPath, "save_0.dat"), "some data");
9.     }
10.  
11.     private void Update()
12.     {
13.          // Doesn't work
14.         if (Input.GetKeyDown(KeyCode.Space))
15.             File.WriteAllText(Path.Combine(Application.persistentDataPath, "save_1.dat"), "some data");
16.     }
17. }
18.  
19.  

 

system.io is not supported on WebGL. There's no file system in a browser.

 

I've managed to fix it:

Code (CSharp):

1.  
2. #if UNITY_WEBGL
3.             Application.ExternalEval("_JS_FileSystem_Sync();");
4. #endif
5.  

 

That's a fantastic solution.
I'm having the same issue trying to make an existing app work for webgl.
Can you post a more complete code of how the entire script looks with the fix.

Cheers