경로 선택 탐색기 팝업 기능 구현

- StandaloneFileBrowser 에셋을 활용한 방법
- dll을 활용한 방법
- 유니티 에디터 자체 기능을 활용한 방

Assets/StandaloneFileBrowser/Sample/CanvasSampleSaveFileText.cs

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+using System.IO;
+using System.Text;
+using System.Runtime.InteropServices;
+using UnityEngine;
+using UnityEngine.UI;
+using UnityEngine.EventSystems;
+using SFB;
+
+[RequireComponent(typeof(Button))]
+public class CanvasSampleSaveFileText : MonoBehaviour, IPointerDownHandler {
+    public Text output;
+
+    // Sample text data
+    private string _data = "Example text created by StandaloneFileBrowser";
+
+#if UNITY_WEBGL && !UNITY_EDITOR
+    //
+    // WebGL
+    //
+    [DllImport("__Internal")]
+    private static extern void DownloadFile(string gameObjectName, string methodName, string filename, byte[] byteArray, int byteArraySize);
+
+    // Broser plugin should be called in OnPointerDown.
+    public void OnPointerDown(PointerEventData eventData) {
+        var bytes = Encoding.UTF8.GetBytes(_data);
+        DownloadFile(gameObject.name, "OnFileDownload", "sample.txt", bytes, bytes.Length);
+    }
+
+    // Called from browser
+    public void OnFileDownload() {
+        output.text = "File Successfully Downloaded";
+    }
+#else
+    //
+    // Standalone platforms & editor
+    //
+    public void OnPointerDown(PointerEventData eventData) { }
+
+    // Listen OnClick event in standlone builds
+    void Start() {
+        var button = GetComponent<Button>();
+        button.onClick.AddListener(OnClick);
+    }
+
+    public void OnClick() {
+        var path = StandaloneFileBrowser.SaveFilePanel("Title", "", "sample", "txt");
+        if (!string.IsNullOrEmpty(path)) {
+            File.WriteAllText(path, _data);
+        }
+    }
+#endif
+}