HRESULT Save(const std::string& containerName,
             const std::string& blobName,
             size_t dataSize,
             const uint8_t* blobData);

using Microsoft::Xbox::Wrappers::GameSave;

std::vector<uint8_t> saveData; // Contains the player's data.

Provider provider = new Provider();

if(SUCCEEDED(provider->Initialize(userHandle, mySCID))
{  
   HRESULT hr = provider->Save("Save_slot_1", "progress", saveData.size(), saveData.data());
   if(FAILED(hr))
   {
      if(hr == E_GS_QUOTA_EXCEEDED)
      {
         // Message that the user must delete saves for this game.
      }
      else if(hr == E_GS_OUT_OF_LOCAL_STORAGE)
      {
         // Message to the user that they have run out of save
         // space on the local device.
      }
      else if(hr == E_GS_UPDATE_TOO_BIG)
      {
         // This is really a development time thing to catch.
         // Your save size was too large for this Save call. Save
         // calls are limited to a maximum size of
         // 16 MB (GS_MAX_BLOB_SIZE).
      }
      else if(hr == E_GS_HANDLE_EXPIRED)
      {
         // You must recreate the provider, and then try again.
      }
      else
      {
         // Log error.
      }
   }
}