Hi there! I understand you're having trouble finding your own 850 custom words in the DuoCards app. Let's get this sorted out together.

To start, could you tell me a bit more? For example:
- Did you create a custom word list or deck within the app?
- Are you logged in with the same account where you saved those words?
- Have you recently changed devices or reinstalled the app?
- Are the words missing from your saved decks, or are they not loading when you open the app?

These details will help me guide you more precisely.

In the meantime, here are some steps to try that often help recover or locate custom word lists:

1. Check Your Account Login: Make sure you’re logged into the same DuoCards account where you initially saved your custom words. Sometimes being logged out or using a different account can cause saved data not to show.

2. Look in Your Flashcard Decks: Open the app and navigate to your flashcard library or custom decks section. Your 850 words should be grouped there if saved properly.

3. Sync or Refresh the App: Sometimes syncing issues can cause content not to appear. Try pulling down to refresh your deck list or look for a sync option in the settings.

4. Saved Data Storage: If you created the word list by pasting or uploading, the words might be saved locally. If the app was reinstalled or cleared its cache, they might be lost unless backed up or synced to your account.

5. Re-import Words: If you have a copy of your 850 words saved elsewhere (like in a document), you can try re-importing them. According to DuoCards FAQ, you can use Ctrl+C (or the equivalent on your device) to copy your word list and paste it when creating a new flashcard set—the app saves each word automatically1.

If after trying these, the words are still missing, please let me know what you find out from the above steps. We can then explore more advanced checks like account data verification or app logs.

Are you able to access your account and check your decks now?