Route export storage hooks through platform services

src/platform_legacy/legacy_platform_services.cpp

@@ -18,6 +18,9 @@ std::string android_get_clipboard();
 bool android_set_clipboard(const std::string& s);
 #elif __APPLE__
 void delete_all_files_in_path(const std::string& source_path);
+#ifdef __IOS__
+void save_image_library(const std::string& path);
+#endif
 #elif __LINUX__
 #include <tinyfiledialogs.h>
 std::string linux_home_path();
@@ -279,6 +282,22 @@ public:
 #endif
     }
 
+    void publish_exported_image(std::string_view path) override
+    {
+#ifdef __IOS__
+        save_image_library(std::string(path));
+#else
+        (void)path;
+#endif
+    }
+
+    void flush_persistent_storage() override
+    {
+#ifdef __WEB__
+        webgl_sync();
+#endif
+    }
+
     [[nodiscard]] bool enables_live_asset_reloading() override
     {
 #if defined(__OSX__)