What are the requirements for extending a 30-day tourist visa in Thailand?

I've used the search function but can't locate the information, Apologies for the request again this time.

Somebody (I think one of the admins) made a very helpful infographic explaining what is needed at immigration in order to extend a tourist visa but 30 days.

Does anybody have this infographic they can share please?

Thank ahead in anticipation 🙏