Zettlr looks great - thanks for producing it. A couple of queries:
1) I work between windows OS laptop and linux (debian) PC. Syncing md files is straightforward between my machines. Though would there be any other issues, such as internal links? Basically, is working across different an OS a problem?
2) Is there any kind of version control/history? If not, could you think of a method, e.g. using git? (which I'm still learning about)