Just out of curiosity

Hi everyone,

Out of curiosity I have two questions. 

- What is the file type  of a note taking file when you write before transforming to send it.

Is it a PNG, JPG file or something else  ???

- My second question concerns the max size of a note taking file. Suppose i decide to only open a one SINGLE note taking file where I write all my ideas, sketches.

Is there a maximum size for it? would the file start bugging after i reach a file Maximum? Has anyone figured out if there s such maximym size file??

Thanks a lot for any comment/answer to these questions!