Thanks for your kind words about Echo. Those of us who created it are really happy the tool is useful to you. :)
See my comments inline below.
We enable email notifications by default for all new users.
Existing users have to opt-in. When we launched the product, we didnít want current users to be overwhelmed by too many email notifications they didnít ask for. At this point, it would be strange to change that policy, given that individual users have sole control over their preferences.
Yes, our multimedia team is hoping to build this Ďyour file was usedí notification in coming months, as specified here:
Stay tuned for more ...
Iím not sure why Thanks would behave differently on Meta. Does anyone know?
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