title: Which is best practice for Firebase storage file structure?
body: <p>I want to store user's profile picture on Firebase storage.</p>
  
  <p>My Firebase database structure is like below.</p>
  
  <pre><code>users
    ㄴ KXkVAYQOV92tW27Wk0C
         ㄴ uid: "EAGZwcgvgAcgErO7rfm7IHI91fk2"
         ㄴ sex: "F"
         ㄴ age: 24
    ㄴ KXkVR1rc2riXyGFl69E
         ㄴ uid: "alE4qM1vg2c9OrW5lVo7IvQk02Hv"
         ㄴ sex: "M"
         ㄴ age: 21
  </code></pre>
  
  <p>And now I'm wondering how my Firebase storage file structure should be.</p>
  
  <p><strong>Idea 1:</strong></p>
  
  <pre><code>images
    ㄴ users
        ㄴ EAGZwcgvgAcgErO7rfm7IHI91fk2
             ㄴ profile.png
             ㄴ something.png
        ㄴ alE4qM1vg2c9OrW5lVo7IvQk02Hv
             ㄴ profile.png
             ㄴ something.png
  </code></pre>
  
  <p><strong>Idea 2:</strong></p>
  
  <pre><code>images
    ㄴ profile
        ㄴ EAGZwcgvgAcgErO7rfm7IHI91fk2.png
        ㄴ alE4qM1vg2c9OrW5lVo7IvQk02Hv.png
    ㄴ something
        ㄴ EAGZwcgvgAcgErO7rfm7IHI91fk2.png
        ㄴ alE4qM1vg2c9OrW5lVo7IvQk02Hv.png
  </code></pre>
  
  <p>Which one is best practice for Firebase storage in performance and usability?<br>
  Any advice would be thankful !</p>
  
  <p><strong>Edit:</strong><br>
  As Lirianer's comment, Database should looks like below.</p>
  
  <pre><code>users
    ㄴ EAGZwcgvgAcgErO7rfm7IHI91fk2
         ㄴ sex: "F"
         ㄴ age: 24
    ㄴ alE4qM1vg2c9OrW5lVo7IvQk02Hv
         ㄴ sex: "M"
         ㄴ age: 21
  </code></pre>