diff --git a/app/soapbox/features/compose/components/upload_button.js b/app/soapbox/features/compose/components/upload_button.js
deleted file mode 100644
index a42e3be1f..000000000
--- a/app/soapbox/features/compose/components/upload_button.js
+++ /dev/null
@@ -1,92 +0,0 @@
-import PropTypes from 'prop-types';
-import React from 'react';
-import ImmutablePropTypes from 'react-immutable-proptypes';
-import ImmutablePureComponent from 'react-immutable-pure-component';
-import { defineMessages, injectIntl } from 'react-intl';
-import { connect } from 'react-redux';
-
-import { IconButton } from '../../../components/ui';
-
-const messages = defineMessages({
-  upload: { id: 'upload_button.label', defaultMessage: 'Add media attachment' },
-});
-
-const onlyImages = types => {
-  return Boolean(types && types.every(type => type.startsWith('image/')));
-};
-
-const makeMapStateToProps = () => {
-  const mapStateToProps = state => ({
-    attachmentTypes: state.getIn(['instance', 'configuration', 'media_attachments', 'supported_mime_types']),
-  });
-
-  return mapStateToProps;
-};
-
-export default @connect(makeMapStateToProps)
-@injectIntl
-class UploadButton extends ImmutablePureComponent {
-
-  static propTypes = {
-    disabled: PropTypes.bool,
-    unavailable: PropTypes.bool,
-    onSelectFile: PropTypes.func.isRequired,
-    style: PropTypes.object,
-    resetFileKey: PropTypes.number,
-    attachmentTypes: ImmutablePropTypes.listOf(PropTypes.string),
-    intl: PropTypes.object.isRequired,
-  };
-
-  handleChange = (e) => {
-    if (e.target.files.length > 0) {
-      this.props.onSelectFile(e.target.files);
-    }
-  }
-
-  handleClick = () => {
-    this.fileElement.click();
-  }
-
-  setRef = (c) => {
-    this.fileElement = c;
-  }
-
-  render() {
-    const { intl, resetFileKey, attachmentTypes, unavailable, disabled } = this.props;
-
-    if (unavailable) {
-      return null;
-    }
-
-    const src = onlyImages(attachmentTypes)
-      ? require('@tabler/icons/icons/photo.svg')
-      : require('@tabler/icons/icons/paperclip.svg');
-
-    return (
-      <div>
-        <IconButton
-          src={src}
-          className='text-gray-400 hover:text-gray-600'
-          title={intl.formatMessage(messages.upload)}
-          disabled={disabled}
-          onClick={this.handleClick}
-        />
-
-        <label>
-          <span className='sr-only'>{intl.formatMessage(messages.upload)}</span>
-          <input
-            key={resetFileKey}
-            ref={this.setRef}
-            type='file'
-            multiple
-            accept={attachmentTypes && attachmentTypes.toArray().join(',')}
-            onChange={this.handleChange}
-            disabled={disabled}
-            className='hidden'
-          />
-        </label>
-      </div>
-    );
-  }
-
-}
diff --git a/app/soapbox/features/compose/components/upload_button.tsx b/app/soapbox/features/compose/components/upload_button.tsx
new file mode 100644
index 000000000..a34e2b4ad
--- /dev/null
+++ b/app/soapbox/features/compose/components/upload_button.tsx
@@ -0,0 +1,81 @@
+import React, { useRef } from 'react';
+import { defineMessages, useIntl } from 'react-intl';
+
+import { IconButton } from 'soapbox/components/ui';
+import { useAppSelector } from 'soapbox/hooks';
+
+import type { List as ImmutableList } from 'immutable';
+
+const messages = defineMessages({
+  upload: { id: 'upload_button.label', defaultMessage: 'Add media attachment' },
+});
+
+const onlyImages = (types: ImmutableList<string>) => {
+  return Boolean(types && types.every(type => type.startsWith('image/')));
+};
+
+interface IUploadButton {
+  disabled: boolean,
+  unavailable: boolean,
+  onSelectFile: (files: FileList) => void,
+  style: React.CSSProperties,
+  resetFileKey: number,
+}
+
+const UploadButton: React.FC<IUploadButton> = ({
+  disabled,
+  unavailable,
+  onSelectFile,
+  resetFileKey,
+}) => {
+  const intl = useIntl();
+
+  const fileElement = useRef<HTMLInputElement>(null);
+  const attachmentTypes = useAppSelector(state => state.instance.configuration.getIn(['media_attachments', 'supported_mime_types']) as ImmutableList<string>);
+
+  const handleChange: React.ChangeEventHandler<HTMLInputElement> = (e) => {
+    if (e.target.files?.length) {
+      onSelectFile(e.target.files);
+    }
+  };
+
+  const handleClick = () => {
+    fileElement.current?.click();
+  };
+
+  if (unavailable) {
+    return null;
+  }
+
+  const src = onlyImages(attachmentTypes)
+    ? require('@tabler/icons/icons/photo.svg')
+    : require('@tabler/icons/icons/paperclip.svg');
+
+  return (
+    <div>
+      <IconButton
+        src={src}
+        className='text-gray-400 hover:text-gray-600'
+        title={intl.formatMessage(messages.upload)}
+        disabled={disabled}
+        onClick={handleClick}
+      />
+
+      <label>
+        <span className='sr-only'>{intl.formatMessage(messages.upload)}</span>
+        <input
+          key={resetFileKey}
+          ref={fileElement}
+          type='file'
+          multiple
+          accept={attachmentTypes && attachmentTypes.toArray().join(',')}
+          onChange={handleChange}
+          disabled={disabled}
+          className='hidden'
+        />
+      </label>
+    </div>
+  );
+};
+
+export default UploadButton;