diff --git a/src/anm2/anm2.cpp b/src/anm2/anm2.cpp
index f994e62..56eee81 100644
--- a/src/anm2/anm2.cpp
+++ b/src/anm2/anm2.cpp
@@ -1546,7 +1546,7 @@ namespace anm2ed
       else
         element_child_id_erase(*container, type, element.id);
       if (type == ElementType::SOUND_ELEMENT || type == ElementType::SPRITESHEET)
-        element.path = path::lower_case_backslash_handle(element.path);
+        element.path = path::backslash_handle(element.path);
       container->children.push_back(element);
     }
 
diff --git a/src/document.cpp b/src/document.cpp
index 6941696..cd684b0 100644
--- a/src/document.cpp
+++ b/src/document.cpp
@@ -5,6 +5,7 @@
 #include <cstdint>
 #include <limits>
 #include <new>
+#include <optional>
 #include <set>
 #include <string_view>
 #include <unordered_map>
@@ -408,7 +409,7 @@ namespace anm2ed
     if (!spritesheet) return false;
 
     util::WorkingDirectory workingDirectory(directory_get());
-    textures[id] = resource::Texture(spritesheet->path);
+    textures[id] = resource::Texture(path::case_insensitive_find(spritesheet->path));
     texturePaths[id] = spritesheet->path;
     return true;
   }
@@ -419,7 +420,7 @@ namespace anm2ed
     if (!sound) return false;
 
     util::WorkingDirectory workingDirectory(directory_get());
-    sounds[id] = resource::Audio(sound->path);
+    sounds[id] = resource::Audio(path::case_insensitive_find(sound->path));
     soundPaths[id] = sound->path;
     return true;
   }
@@ -439,7 +440,7 @@ namespace anm2ed
                           texturePaths.at(spritesheet.id) != spritesheet.path;
           if (isReload)
           {
-            textures[spritesheet.id] = resource::Texture(spritesheet.path);
+            textures[spritesheet.id] = resource::Texture(path::case_insensitive_find(spritesheet.path));
             texturePaths[spritesheet.id] = spritesheet.path;
           }
         }
@@ -469,7 +470,7 @@ namespace anm2ed
               !sounds.contains(sound.id) || !soundPaths.contains(sound.id) || soundPaths.at(sound.id) != sound.path;
           if (isReload)
           {
-            sounds[sound.id] = resource::Audio(sound.path);
+            sounds[sound.id] = resource::Audio(path::case_insensitive_find(sound.path));
             soundPaths[sound.id] = sound.path;
           }
         }
@@ -1575,7 +1576,10 @@ namespace anm2ed
     for (auto& path : paths)
     {
       auto pathCopy = path;
-      auto loadPath = path::lower_case_backslash_handle(pathCopy);
+      auto storagePath = path::backslash_handle(pathCopy);
+      std::optional<WorkingDirectory> workingDirectory{};
+      if (!storagePath.is_absolute()) workingDirectory.emplace(directory);
+      auto loadPath = path::case_insensitive_find(storagePath);
       auto texture = resource::Texture(loadPath);
       if (!texture.is_valid())
       {
@@ -1586,7 +1590,7 @@ namespace anm2ed
         continue;
       }
 
-      loaded.push_back({.relativePath = path::backslash_replace(path::make_relative(loadPath, directory)),
+      loaded.push_back({.relativePath = path::backslash_replace(path::make_relative(storagePath, directory)),
                         .texture = std::move(texture)});
     }
     if (loaded.empty()) return;
@@ -1639,12 +1643,12 @@ namespace anm2ed
       auto id = element_child_next_id_get(*items, ElementType::SOUND_ELEMENT);
       auto soundElement = element_make(ElementType::SOUND_ELEMENT);
       soundElement.id = id;
-      auto loadPath = path::lower_case_backslash_handle(path);
+      auto loadPath = path::backslash_handle(path);
       auto relativePath = path::backslash_replace(path::make_relative(loadPath, directory));
       {
         WorkingDirectory workingDirectory(directory_get());
         soundElement.path = relativePath;
-        sounds[id] = resource::Audio(soundElement.path);
+        sounds[id] = resource::Audio(path::case_insensitive_find(soundElement.path));
         soundPaths[id] = soundElement.path;
       }
       auto soundPath = path::to_utf8(soundElement.path);
diff --git a/src/imgui/window/window.cpp b/src/imgui/window/window.cpp
index 10a77bf..21c661e 100644
--- a/src/imgui/window/window.cpp
+++ b/src/imgui/window/window.cpp
@@ -297,7 +297,7 @@ namespace anm2ed::imgui
 
   std::filesystem::path window_asset_path_get(Document& document, const std::filesystem::path& path)
   {
-    auto loadPath = path::lower_case_backslash_handle(path);
+    auto loadPath = path::backslash_handle(path);
     return path::backslash_replace(path::make_relative(loadPath, document.directory_get()));
   }
 
@@ -2326,8 +2326,28 @@ namespace anm2ed::imgui
                                   auto behavior = [&]()
                                   {
                                     auto spritesheet = document.anm2.element_get(ElementType::SPRITESHEET, id);
-                                    if (!spritesheet) return;
-                                    spritesheet->path = window_asset_path_get(document, dialogPath);
+                                    auto texture = document.texture_get(id);
+                                    if (!spritesheet || !texture) return;
+                                    auto newPath = window_asset_path_get(document, dialogPath);
+                                    auto pathString = path::to_utf8(newPath);
+                                    WorkingDirectory workingDirectory(document.directory_get());
+                                    path::ensure_directory(newPath.parent_path());
+                                    if (!texture->write_png(newPath))
+                                    {
+                                      toasts.push(std::vformat(localize.get(TOAST_SAVE_SPRITESHEET_FAILED),
+                                                               std::make_format_args(id, pathString)));
+                                      logger.error(
+                                          std::vformat(localize.get(TOAST_SAVE_SPRITESHEET_FAILED, anm2ed::ENGLISH),
+                                                       std::make_format_args(id, pathString)));
+                                      return;
+                                    }
+                                    spritesheet->path = newPath;
+                                    document.texturePaths[id] = spritesheet->path;
+                                    document.spritesheet_hash_set_saved(id);
+                                    toasts.push(std::vformat(localize.get(TOAST_SAVE_SPRITESHEET),
+                                                             std::make_format_args(id, pathString)));
+                                    logger.info(std::vformat(localize.get(TOAST_SAVE_SPRITESHEET, anm2ed::ENGLISH),
+                                                             std::make_format_args(id, pathString)));
                                   };
 
                                   window_edit(document, Document::SPRITESHEETS,
diff --git a/src/util/path.cpp b/src/util/path.cpp
index ccfa1e8..346666d 100644
--- a/src/util/path.cpp
+++ b/src/util/path.cpp
@@ -118,15 +118,55 @@ namespace anm2ed::util::path
     return path;
   }
 
-  std::filesystem::path lower_case_backslash_handle(const std::filesystem::path& path)
+  std::filesystem::path backslash_handle(const std::filesystem::path& path)
   {
     auto newPath = path;
     if (is_exist(newPath)) return newPath;
 
     newPath = backslash_replace(newPath);
-    if (is_exist(newPath)) return newPath;
-
-    newPath = to_lower(newPath);
     return newPath;
   }
+
+  std::filesystem::path case_insensitive_find(const std::filesystem::path& path)
+  {
+    auto handledPath = backslash_handle(path);
+    if (is_exist(handledPath)) return handledPath;
+
+    auto resolvedPath = handledPath.root_path();
+    for (const auto& part : handledPath.relative_path())
+    {
+      auto candidate = resolvedPath / part;
+      if (is_exist(candidate))
+      {
+        resolvedPath = candidate;
+        continue;
+      }
+
+      auto parent = resolvedPath.empty() ? std::filesystem::path(".") : resolvedPath;
+      std::error_code ec{};
+      bool isFound{};
+      if (std::filesystem::is_directory(parent, ec))
+      {
+        auto partLower = to_lower(part);
+        std::filesystem::directory_iterator it(parent, ec);
+        std::filesystem::directory_iterator end{};
+        for (; !ec && it != end; it.increment(ec))
+          if (to_lower(it->path().filename()) == partLower)
+          {
+            resolvedPath /= it->path().filename();
+            isFound = true;
+            break;
+          }
+      }
+
+      if (!isFound) resolvedPath = candidate;
+    }
+
+    if (is_exist(resolvedPath)) return resolvedPath;
+
+    auto lowerPath = to_lower(handledPath);
+    if (is_exist(lowerPath)) return lowerPath;
+
+    return handledPath;
+  }
 }
diff --git a/src/util/path.hpp b/src/util/path.hpp
index 8a979b6..bcaba0a 100644
--- a/src/util/path.hpp
+++ b/src/util/path.hpp
@@ -18,5 +18,6 @@ namespace anm2ed::util::path
 
   bool ensure_directory(const std::filesystem::path&);
 
-  std::filesystem::path lower_case_backslash_handle(const std::filesystem::path&);
+  std::filesystem::path backslash_handle(const std::filesystem::path&);
+  std::filesystem::path case_insensitive_find(const std::filesystem::path&);
 }
diff --git a/workshop/metadata.xml b/workshop/metadata.xml
index 662df09..4247886 100644
--- a/workshop/metadata.xml
+++ b/workshop/metadata.xml
@@ -53,6 +53,6 @@ Alternatively, if you have subscribed to the mod, you can find the latest releas
 [h3]Happy animating![/h3]
 [img]https://files.catbox.moe/4auc1c.gif[/img]
 </description>
-    <version>2.20</version>
+    <version>2.21</version>
     <visibility>Public</visibility>
 </metadata>