diff --git a/MobileGL/MG_Backend/DirectGLES/Managers.cpp b/MobileGL/MG_Backend/DirectGLES/Managers.cpp
index 5eca0e85..9aea790e 100644
--- a/MobileGL/MG_Backend/DirectGLES/Managers.cpp
+++ b/MobileGL/MG_Backend/DirectGLES/Managers.cpp
@@ -111,7 +111,7 @@ namespace MobileGL::MG_Backend::DirectGLES {
                 (invalidate ? GL_MAP_INVALIDATE_BUFFER_BIT : 0) | GL_MAP_WRITE_BIT | GL_MAP_UNSYNCHRONIZED_BIT);
             const void* data = stateBufferObject->GetDataReadOnly()->data();
             if (mappedData) {
-                Memcpy(reinterpret_cast<const void*>(reinterpret_cast<const char*>(data) + range.start), mappedData,
+                Memcpy(mappedData, ((const char*)(data) + range.start),
                        range.end - range.start);
                 MGLOG_D("Mapped buffer data successfully for object with ID: %u", m_backendBufferId);
                 MG_External::GLES::glUnmapBuffer(TempBufferTarget);
diff --git a/MobileGL/MG_Impl/GLImpl/Texture/GL_Texture.cpp b/MobileGL/MG_Impl/GLImpl/Texture/GL_Texture.cpp
index f2adb57b..7082fd80 100644
--- a/MobileGL/MG_Impl/GLImpl/Texture/GL_Texture.cpp
+++ b/MobileGL/MG_Impl/GLImpl/Texture/GL_Texture.cpp
@@ -80,7 +80,7 @@ namespace MobileGL {
                 SizeT srcOffset = row * width * bytesPerPixel;
 
                 if (dstOffset + width * bytesPerPixel < data.size()) {
-                    Memcpy(srcData + srcOffset, data.data() + dstOffset, width * bytesPerPixel);
+                    Memcpy(data.data() + dstOffset, srcData + srcOffset, width * bytesPerPixel);
                 } else {
                     MG_State::pGLContext->RecordError(
                             ErrorCode::InvalidOperation,
@@ -286,7 +286,8 @@ namespace MobileGL {
 
             // ======================= Processing ================================
             SharedPtr<MG_State::GLState::ITextureObject> textureObject = nullptr;
-            if (TextureImpl::IsProxyTextureTarget(textureUploadingTarget)) {
+            Bool isProxy = TextureImpl::IsProxyTextureTarget(textureUploadingTarget);
+            if (isProxy) {
                 textureObject =
                     TextureImpl::pProxyTextureManager->CreateOrReplaceProxyTextureObject(textureUploadingTarget);
             } else {
@@ -300,14 +301,14 @@ namespace MobileGL {
             if (!TextureImpl::ValidateTextureObject(textureObject)) return;
 
             // ======================= Processing ================================
-            SizeT imageSize =
+            SizeT imageSize = isProxy ? 0 :
                     MG_Util::CalculateInputTextureImageSize(textureInternalFormat,
                                                             texturePixelDataType,
                                                             {width, height, 1});
 
             textureObject->SetInternalFormat(textureInternalFormat);
             MG_State::GLState::MipmapLevelInput mipmap = MG_State::GLState::MipmapLevelInput(
-                {width, height, 1}, level, false, 0, {const_cast<void*>(pixels), imageSize});
+                {width, height, 1}, level, false, 0, {const_cast<void*>(isProxy ? pixels : nullptr), imageSize});
             textureObject->SetMipmapLevel(mipmap);
         }
 
diff --git a/MobileGL/MG_State/GLState/TextureState/TextureObject.h b/MobileGL/MG_State/GLState/TextureState/TextureObject.h
index 83c13bc2..b6a89f93 100644
--- a/MobileGL/MG_State/GLState/TextureState/TextureObject.h
+++ b/MobileGL/MG_State/GLState/TextureState/TextureObject.h
@@ -189,9 +189,10 @@ namespace MobileGL {
                 Bool dirty = true;
 
                 MipmapLevelInternal(const MipmapLevelInput& input) : MipmapLevelBase(input) {
+                    data.resize(input.inputData.size);
                     if (input.inputData.data && input.inputData.size > 0) {
                         const Uint8* src = static_cast<const Uint8*>(input.inputData.data);
-                        data.assign(src, src + input.inputData.size);
+                        Memcpy(data.data(), src, input.inputData.size);
                     }
                 }
             };
diff --git a/MobileGL/MG_Util/Types.h b/MobileGL/MG_Util/Types.h
index 4b520792..a1b73ab4 100644
--- a/MobileGL/MG_Util/Types.h
+++ b/MobileGL/MG_Util/Types.h
@@ -56,7 +56,7 @@ namespace MobileGL {
     inline constexpr void Copy(const T* src, T* dest, SizeT count) {
         std::copy(src, src + count, dest);
     }
-    inline constexpr void Memcpy(const void* src, void* dest, SizeT size) {
+    inline constexpr void Memcpy(void* dest, const void* src, SizeT size) {
         std::memcpy(dest, src, size);
     }
     template <typename... Ts>