Free writing apps?

iOS and iPadOS

Hello. I am going to write a book. I would like a good writing app that works with VoiceOver where I can organize my chapters and maybe, but not nessesarely, make folders. I am planning to write a lot. I have decided to split the book in certain chapters and need an organized way to put the chapters together, using braille input on screen, wich is the fastest way for me to write. I couldn't make google documents to work. I don't know if it is accessible. I have a bluetooth keyboard that I can use if I have to. Thanks in advance. //Bree