Yes, you only want to map fields here if you want to override the default assistant settings.
For thread ID, if you want to reuse the same thread at a later date, you have to store & retrieve the thread ID. This can be useful if you have multiple “chats” by different users using your assistants. More info about it is here Telegram chatbot (incomplete) - #3 by samliew
If you want retrieval of multiple assistant file IDs, I have mentioned about mapping the Files field in this thread, Call OpenAI assistant with variable number of file IDs - #2 by samliew
For more information, see