The Knowledge Base function should still be available in the free version of Voiceflow. However, the visibility of certain options in the sidebar can depend on the type of assistant you're designing. In Voiceflow, there are different assistant types - mainly (1) Voice and (2) Chat assistant types. Depending on the assistant type you've selected, certain functionalities may or may not be supported.
For example, a Speak step would only be available on a Voice Assistant as the computer will speak aloud to the user, whereas that would not be possible with a Chat Assistant. Each of the channels and/or assistant types will have access to different Steps, design/publish-aspects, and features according to the native functionality of the channel you are designing for.
If you're not seeing the Knowledge Base option, it's possible that you may not have selected the intended assistant type when first creating your assistant. Ensure you select the desired step or plan for the specifics of the assistant you aim to design & publish.
If you're still having trouble, it might be worth checking if there have been any changes to your settings that could be affecting this. You can adjust the AI model, temperature, max tokens, instructions, and system prompt which will override the global KB settings. If you're satisfied with the preview results, you must manually update these preferences in the KB Settings to apply them globally.
I hope this helps! If you have any other questions, feel free to ask.
