Official comment
Neither of those are supported file systems; you need to use FAT32 or HFS+ (Mac) for it to be compatible as an export device with Pioneer DJ products, including rekordbox.
If you wanted to use that as a source for your files, it can be loaded as such and music can be imported to rekordbox, but as exFAT and NTFS are not supported by the hardware units, they can't be used for export.
See this article for some tools to use.