Create generic UploadProgress component, have composer use it

app/soapbox/components/upload-progress.tsx

@@ -0,0 +1,42 @@
+import React from 'react';
+import { FormattedMessage } from 'react-intl';
+import { spring } from 'react-motion';
+
+import { HStack, Icon, Stack, Text } from 'soapbox/components/ui';
+import Motion from 'soapbox/features/ui/util/optional_motion';
+
+interface IUploadProgress {
+  /** Number between 0 and 1 to represent the percentage complete. */
+  progress: number,
+}
+
+/** Displays a progress bar for uploading files. */
+const UploadProgress: React.FC<IUploadProgress> = ({ progress }) => {
+  return (
+    <HStack alignItems='center' space={2}>
+      <Icon
+        src={require('@tabler/icons/icons/cloud-upload.svg')}
+        className='w-7 h-7 text-gray-500'
+      />
+
+      <Stack space={1}>
+        <Text theme='muted'>
+          <FormattedMessage id='upload_progress.label' defaultMessage='Uploading…' />
+        </Text>
+
+        <div className='w-full h-1.5 rounded-lg bg-gray-200 relative'>
+          <Motion defaultStyle={{ width: 0 }} style={{ width: spring(progress) }}>
+            {({ width }) =>
+              (<div
+                className='absolute left-0 top-0 h-1.5 bg-primary-600 rounded-lg'
+                style={{ width: `${width}%` }}
+              />)
+            }
+          </Motion>
+        </div>
+      </Stack>
+    </HStack>
+  );
+};
+
+export default UploadProgress;

app/soapbox/features/compose/components/upload-progress.tsx

@@ -1,13 +1,10 @@
 import React from 'react';
-import { FormattedMessage } from 'react-intl';
-import { spring } from 'react-motion';
 
-import { HStack, Icon, Stack, Text } from 'soapbox/components/ui';
+import UploadProgress from 'soapbox/components/upload-progress';
 import { useAppSelector } from 'soapbox/hooks';
 
-import Motion from '../../ui/util/optional_motion';
-
-const UploadProgress = () => {
+/** File upload progress bar for post composer. */
+const ComposeUploadProgress = () => {
   const active = useAppSelector((state) => state.compose.get('is_uploading'));
   const progress = useAppSelector((state) => state.compose.get('progress'));
 
@@ -16,30 +13,8 @@ const UploadProgress = () => {
   }
 
   return (
-    <HStack alignItems='center' space={2}>
-      <Icon
-        src={require('@tabler/icons/icons/cloud-upload.svg')}
-        className='w-7 h-7 text-gray-500'
-      />
-
-      <Stack space={1}>
-        <Text theme='muted'>
-          <FormattedMessage id='upload_progress.label' defaultMessage='Uploading…' />
-        </Text>
-
-        <div className='w-full h-1.5 rounded-lg bg-gray-200 relative'>
-          <Motion defaultStyle={{ width: 0 }} style={{ width: spring(progress) }}>
-            {({ width }) =>
-              (<div
-                className='absolute left-0 top-0 h-1.5 bg-primary-600 rounded-lg'
-                style={{ width: `${width}%` }}
-              />)
-            }
-          </Motion>
-        </div>
-      </Stack>
-    </HStack>
+    <UploadProgress progress={progress} />
   );
 };
 
-export default UploadProgress;
+export default ComposeUploadProgress;