Merge pull request #13249 from edx/zoldak/fix-flaky-video-test

Wait for the transcript file chooser input field to be visible

common/test/acceptance/pages/studio/video/video.py

@@ -639,6 +639,8 @@ class VideoComponentPage(VideoPage):
         # Show the Browse Button
         self.browser.execute_script("$('form.file-chooser').show()")
         asset_file_path = self.file_path(transcript_filename)
-        self.q(css=CLASS_SELECTORS['attach_transcript']).results[0].send_keys(asset_file_path)
+        attach_css = CLASS_SELECTORS['attach_transcript']
+        self.wait_for_element_visibility(attach_css, "The file chooser's input field is visible.")
+        self.q(css=attach_css).results[0].send_keys(asset_file_path)
         # confirm upload completion
-        self._wait_for(lambda: not self.q(css=CLASS_SELECTORS['attach_transcript']).visible, 'Upload Completed')
+        self._wait_for(lambda: not self.q(css=attach_css).visible, 'Upload Completed')