Filename Requirements
In order to sync files or folders, they must comply with any filename restrictions on the destination folder, as well as overall requirements for filenames on Files.com. For example, Files.com disallows spaces at the end of file/folder names.
If Files.com encounters files that would not be allowed on the Files.com side, the sync will result in a Partial Failure. Failure details can be viewed in the External Logs.
Case Sensitivity
Syncs use the Files.com case sensitivity rules.
Files.com will use a best-effort to have case conversions work intelligently, however, it's impossible to perfectly model an ideal behavior in this situation.