Big Waveforms dont show on Pioneer XDJ RX

Pioneer what would you suggest as a user friendly decent brand of USB to buy!? As I have 3 that are all Sandisk but with high memory usb3

I have found the WAV forms are there if I search for the single track but not when loooking at folders, why is this? If I press browse when using folders, the screen shows like the WAV form should be there. But nothing comes through,
also when the WAV form can be used it does seem fluid, it's quite stuttering

@Tony > When browsing folders, you're browsing the files directly; this does not load the associated rekordbox data as if you were to load the track from any of the non-folder options.

@Tony > As far as which USB memory to purchase, the only Sandisk-brand drive I recommend is the Extreme Pro 3.1, I can't vouch for any other model as they simply can't perform as well. My other preferred drive is the Corsair GTX - it uses a SSD-based chipset manager and features incredibly fast write speeds.

Had the same issue with an out of the box 128GB USB 2.0 TOSHIBA U203 stick. Using the HP formatting tool solved it. Thanks.