title: How to post multipart/formdata using fetch in react-native?
body: <p><img src="https://i.stack.imgur.com/Ryb0G.png" alt="reference Image: Postman form"></p>
  
  <p>i want to post Form Data like that.</p>
  
  <p>what should i prepare for sending image file data? </p>
  
  <p>i have Uri, type, filename, size.</p>
  
  <p>then will use fetch for it.</p>
  
  <p>Content-type in header is 'multipart/formdata'</p>
  
  <p>thanks for helping </p>