title: upload file cause the error "net::ERR_UPLOAD_FILE_CHANGED"
body: <p><a href="https://i.stack.imgur.com/2wtIj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2wtIj.png" alt="enter image description here" /></a></p>
  <p>I am using C#.net Core for the back-end API and angular 6 for the front-end. When I upload a file to test on my localhost, when i try upload, it always give me error &quot;net::ERR_UPLOAD_FILE_CHANGED&quot; for some reason, but after a maybe one minute or two, then i try upload again. the error is gone and file successful upload, i try another test, it keep happening, and always after few minutes, then error gone and file can be upload, why does the first time when i try to upload it give me &quot;net::ERR_UPLOAD_FILE_CHANGED&quot;.</p>
  <p>Can someone help me on this, thank you so much</p>