Imports with Audio fail frequently, repeated imports create duplicates.

[lucmartialadam]

Describe the bug Whenever I try to import a deck with "download audio" checked, it fails repeatedly. It seems to be able to import a few before breaking. If I uncheck download audio, it imports perfectly. The decks themselves work perfectly fine on quizlet with audio.

Quizlet deck URL I've tried this with multiple decks with audio with the same result.

https://quizlet.com/312676214/bi-hfw-1-5-unit-2-vocabulary-flash-cards/

Additional context Error from the addon window

"Caught exception: Traceback (most recent call last): File "/Users/lucienadam/Library/Application Support/Anki2/addons21/1362209126/init.py", line 373, in onCode self.createDeck(deck) File "/Users/lucienadam/Library/Application Support/Anki2/addons21/1362209126/init.py", line 426, in createDeck file_name = self.fileDownloader(self.getAudioUrl( File "/Users/lucienadam/Library/Application Support/Anki2/addons21/1362209126/init.py", line 480, in fileDownloader raise e File "/Users/lucienadam/Library/Application Support/Anki2/addons21/1362209126/init.py", line 471, in fileDownloader r = urllib2.urlopen(urllib2.Request(url, headers=headers)) File "urllib.request", line 214, in urlopen File "urllib.request", line 523, in open File "urllib.request", line 632, in http_response File "urllib.request", line 561, in error File "urllib.request", line 494, in _call_chain File "urllib.request", line 641, in http_error_default urllib.error.HTTPError: HTTP Error 504: Gateway Timeout"

I've gotten 502 and 400 as well.

[sviatoslav-lebediev]

Hi, I would try to check your network connection and if you still have this issue - try to check Skip errors, it will skip a few audios that it can't download for some reason.