A few months ago, fileserve started automatically replacing spaces by underscores in filenames. Now if this was being done only on URLs, it would make sense as it would avoid some corrupt URLs, but they're doing it on the actual filenames. If what you are trying to achieve is correct filenames that the user won't need to change, this can be a problem.
My request is.. can you please include an option that if enabled, after upload, the uploader checks what the assigned filename is, and if it's different from the one on the hard drive, it renames it?
I hope you consider this change. Thanks for all the hard work that you do.