Where you’re likely to find written paper used as “a compound noun” is in the context of exams – specifically things like driving or language tests (with practical/oral tests which can be distinguished from the written part of the exam).

How do you use written paper to mean a piece of paper with words which is written on a board? As an attribute adjective (coming before a noun), written is usually only used in contexts where it distinguishes something from other possible formats (spoken, illustrated, acted out, etc.).

In purely practical terms you probably wouldn’t change a night’s dream on paper and make things in writing, even if editing is a computer program. Most likely you’d just make changes as you write the text, so… Some

people get relief from bad dreams by writing them down on paper, changing the negative stories or thoughts into positive ones. If they studied the paper before

for stylistic reasons I’d probably change writing to writing and be sure to add but

before changing setting to the paper.