title: Logic Apps Blob overwriting file of same name
body: <p>So I am posting the below JSON to a Logic App via a Http-Request-Trigger.</p>
  
  <pre><code>{
      "RequestMetaDataValue": {
          "RequestMetaDataUuid": "33333333-3333-3333-3333-333333333333"
      },
      "OtherStuff": [{
          "OtherStuffUuid": "11111111-1111-1111-1111-1111",
          "OtherStuffString": "peanut"
      },
      {
          "OtherStuffUuid": "e5dceac3-51cb-477b-b3a9-bd08f351cc0e",
          "OtherStuffString": "banana"
      }]
  }
  </code></pre>
  
  <p>The Logic App parses the Json, so I can extract the RequestMetaDataUuid value.  In this case "33333333-3333-3333-3333-333333333333".</p>
  
  <p>I then use a Create Blob (action?) as seen here:</p>
  
  <p><a href="https://docs.microsoft.com/en-us/azure/connectors/connectors-create-api-azureblobstorage" rel="nofollow noreferrer">https://docs.microsoft.com/en-us/azure/connectors/connectors-create-api-azureblobstorage</a></p>
  
  <p>And how it looks like in my Designer</p>
  
  <p><a href="https://i.stack.imgur.com/r1ftT.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/r1ftT.png" alt="enter image description here"></a></p>
  
  <p>So fairly straight forward.</p>
  
  <p>Here's the issue.</p>
  
  <p>If I resend the (same) Json, the blob/file gets <strong>overwritten</strong> in the blob.</p>
  
  <p>For example, if I change</p>
  
  <pre><code>"OtherStuffUuid": "11111111-1111-1111-1111-1111",
  </code></pre>
  
  <p>to</p>
  
  <pre><code>"OtherStuffUuid": "aaaaaaaa-1111-1111-1111-1111",
  </code></pre>
  
  <p>The blob that originally had "OtherStuffUuid": "11111111-1111-1111-1111-1111" goes to never-never land.  :(</p>
  
  <p>If there anyway to prevent overwrite?</p>
  
  <p>Is there anyway to check that the blob/file already exists (my preference) in the blob storage?</p>
  
  <p>APPEND</p>
  
  <p>Based on an answer, I tried to add the following pre-check.</p>
  
  <p><a href="https://i.stack.imgur.com/nnqgy.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nnqgy.png" alt="enter image description here"></a></p>
  
  <p>Documentation here:</p>
  
  <p><a href="https://docs.microsoft.com/en-us/connectors/azureblob/#Get_Blob_Metadata_using_path" rel="nofollow noreferrer">https://docs.microsoft.com/en-us/connectors/azureblob/#Get_Blob_Metadata_using_path</a></p>
  
  <blockquote>
    <p>Get Blob Metadata using path Operation ID: GetFileMetadataByPath This
    operation retrieves blob metadata using path.</p>
    
    <p>Required Parameters Blob path string Specify unique path to the blob
    Key: path</p>
    
    <p><strong>Returns</strong> Body BlobMetadata Blob metadata</p>
  </blockquote>