General Considerations

As a user it is important that you keep your private key save. It is best to make a backup to be able to restore files, in case you reinstalled the browser.

Note that the key is saved in your operating system profile so make sure your home folder is encrypted and noone has access to it.

Check your keys

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You should regulary check the keys on your system.

If you notice a new one or don't recognize one, notify the system adminsitrator to check the logs. it might be an incursion attempt.

You should also avoid having too many different keys, in case one is compromised.

Uploading

When uploading always check for how many users the file is shared, and take note of the message telling you for how many keys the file will be encrypted:

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If you only share the file with one person, then it should normally be encrypted for 2 keys (your own and the target user).

If it shows more it might be:

That you or your target have more than one device activated for e2ee with different keys (in that case the number should be equal to your keys + number of the target keys). Make sure to verify with the recipient how many different keys he has.
You shared the folder for more people

If the number of keys does NOT match up, make sure to notify the administrator immediatly as this might possibly be an incursion attempt.