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hey could you make a video tutorial for this?

Hey there, I am sorry I am not really into video making at all. If you have specific questions just fire away. In general the .json files included in the project should be self explanatory, also there is some documentation in the script, if that doesn't cover it just come back here with your questions.
The general concept is:
- Make a new script that triggers the dialogue in any way you need it (overlap with character, button press, anything else)
- Get a reference to the main UI script provided (with get_node() or with an autoload

- Then you call LoadFile("Name Of File Here")
- And finaly you call StartDialogue()

Everything else should be setup inside each .json file for each dialogue you have created, including names,text,options and where they lead etc. The one included should give a good representation of what you can do with it.

If you don't know how .json files work (or are supposed to work anyway, they are plain text files after all, they just have defined structure is all) you should check out a generic json tutorial , it should clear most things up.