Are continued conversations supported?

[izcoser]

To keep conversation context, I tried both:

1. creating a conversation and then using the conversationId in api.sendMessage;
2. sending a message with api.sendMessage, saving the conversationId from that response and reusing it later.

Neither method worked. The answer always comes with an empty string.
Normal messages without specifying conversationId work as expected.

I am wondering if this is supported at all, since it's not included in the README.md? Thanks.