Use a universally supported library for file picking

Assets/Plugins/SimpleFileBrowser/Scripts/FileBrowserAccessRestrictedPanel.cs

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+using System.Collections.Generic;
+using TMPro;
+using UnityEngine;
+using UnityEngine.UI;
+#if ENABLE_INPUT_SYSTEM && !ENABLE_LEGACY_INPUT_MANAGER
+using UnityEngine.InputSystem;
+#endif
+
+namespace SimpleFileBrowser
+{
+	public class FileBrowserAccessRestrictedPanel : MonoBehaviour
+	{
+#pragma warning disable 0649
+		[SerializeField]
+		private HorizontalLayoutGroup contentLayoutGroup;
+
+		[SerializeField]
+		private TextMeshProUGUI messageLabel;
+
+		[SerializeField]
+		private Button okButton;
+#pragma warning restore 0649
+
+		private void Awake()
+		{
+			okButton.onClick.AddListener( OKButtonClicked );
+		}
+
+		internal void Show()
+		{
+			gameObject.SetActive( true );
+		}
+
+#if UNITY_EDITOR || UNITY_STANDALONE || UNITY_WSA || UNITY_WSA_10_0
+		private void LateUpdate()
+		{
+#if ENABLE_INPUT_SYSTEM && !ENABLE_LEGACY_INPUT_MANAGER
+			if( Keyboard.current != null )
+#endif
+			{
+				// Handle keyboard shortcuts
+#if ENABLE_INPUT_SYSTEM && !ENABLE_LEGACY_INPUT_MANAGER
+				if( Keyboard.current[Key.Enter].wasPressedThisFrame || Keyboard.current[Key.NumpadEnter].wasPressedThisFrame || Keyboard.current[Key.Escape].wasPressedThisFrame )
+#else
+				if( Input.GetKeyDown( KeyCode.Return ) || Input.GetKeyDown( KeyCode.KeypadEnter ) || Input.GetKeyDown( KeyCode.Escape ) )
+#endif
+					OKButtonClicked();
+			}
+		}
+#endif
+
+		internal void RefreshSkin( UISkin skin )
+		{
+			contentLayoutGroup.padding.bottom = 22 + (int) ( skin.RowSpacing + skin.RowHeight );
+
+			Image background = GetComponentInChildren<Image>();
+			background.color = skin.PopupPanelsBackgroundColor;
+			background.sprite = skin.PopupPanelsBackground;
+
+			RectTransform buttonsParent = (RectTransform) okButton.transform.parent;
+			buttonsParent.sizeDelta = new Vector2( buttonsParent.sizeDelta.x, skin.RowHeight );
+
+			skin.ApplyTo( okButton );
+			skin.ApplyTo( messageLabel, skin.PopupPanelsTextColor );
+		}
+
+		private void OKButtonClicked()
+		{
+			gameObject.SetActive( false );
+		}
+	}
+}