@Lode
You should have in mind that Android was developed as a phone OS and not a computer OS with a file handling system built in. Hence, almost all apps keep their data files in their own directories. I understand you prefer to save those document files to external memory to save room on the internal storage.
The simplest way to do that is by installing a file management app like ESFile. Then after saving your file you just move it to extension memory. Just keep in mind that you don't want to do that until you are completely finished with the document. Otherwise the app will not be able to open the document.
Also, if you are working on a book the Max Carta is great for text input, but only text input. All the formatting should be done on a "real" computer with a decent screen when you edit your documents, the e-ink Carta screen is just not detailed enough to see formatting details well enough.
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