title: Log Logic Apps error messages to Azure storage file
body: <p>I have some steps in my logic apps eg Parse JSON.  If they fail, I can see the reason for the failure when I open the step in logic apps eg string instead of integer.
  How can I log these error messages in my Azure storage account.
  The dynamic content dialogue box doesn't specify error messages.
  I have created a storage account, created files, populated them with a string and put them into the storage account.  I just need to get hold of the error message.
  I will be processing JSON from HTTP requests.  If the JSON is invalid ie does not conform to the expected schema, I need the error logged, so people can query it with the provider of the data.</p>
  
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