Rename JSX files with proper .jsx extension (#23733)

app/javascript/mastodon/features/compose/components/upload_form.jsx

@@ -0,0 +1,32 @@
+import React from 'react';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import UploadProgressContainer from '../containers/upload_progress_container';
+import ImmutablePureComponent from 'react-immutable-pure-component';
+import UploadContainer from '../containers/upload_container';
+import SensitiveButtonContainer from '../containers/sensitive_button_container';
+
+export default class UploadForm extends ImmutablePureComponent {
+
+  static propTypes = {
+    mediaIds: ImmutablePropTypes.list.isRequired,
+  };
+
+  render () {
+    const { mediaIds } = this.props;
+
+    return (
+      <div className='compose-form__upload-wrapper'>
+        <UploadProgressContainer />
+
+        <div className='compose-form__uploads-wrapper'>
+          {mediaIds.map(id => (
+            <UploadContainer id={id} key={id} />
+          ))}
+        </div>
+
+        {!mediaIds.isEmpty() && <SensitiveButtonContainer />}
+      </div>
+    );
+  }
+
+}