Dropbox is case-insensitive: it does not allow files “Readme.txt” and “readme.txt” to exist at the same location. This likely is a deliberate choice to enable syncing between case-sensitive and -insensitive file systems. However, Dropbox is case-preserving so that a file created as “readme.txt” is shown as “readme.txt” and a file created as “Readme.txt” is shown as “Readme.txt”.
This may cause issues when your local file system is case sensitive. On such systems, when you create a new file or folder with a name that already exists but with different casing, Maestral will rename it by appending “(case conflict)” before it is uploaded.