Fix broken asset uploads

indra/newview/llviewerassetstorage.cpp

@@ -299,7 +299,7 @@ void LLViewerAssetStorage::storeAssetData(
         legacy->mUpCallback = callback;
         legacy->mUserData = user_data;
 
-        LLFileSystem file(asset_id, asset_type, LLFileSystem::WRITE);
+        LLFileSystem file(asset_id, asset_type, LLFileSystem::APPEND);
 
         const S32 buf_size = 65536;
         U8 copy_buf[buf_size];

indra/newview/llviewerassetupload.cpp

@@ -473,7 +473,7 @@ LLSD LLNewFileResourceUploadInfo::exportTempFile()
     infile.open(filename, LL_APR_RB, NULL, &file_size);
     if (infile.getFileHandle())
     {
-        LLFileSystem file(getAssetId(), assetType, LLFileSystem::WRITE);
+        LLFileSystem file(getAssetId(), assetType, LLFileSystem::APPEND);
 
         const S32 buf_size = 65536;
         U8 copy_buf[buf_size];