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Please please please can you add a feature that allows folders to be excluded from the Dropbox account (on windows and mac). For sure I'm not the first person to request this, but I'm yet to find a g...
https://koofr.eu/blog/posts/advanced-ways-to-exclude-files-from-sync-part-2 has this exact feature. A .syncignore file that works like a .gitignore. So have a look at how they implemented it and copy it.