Hantek DSO5102P saves CSV to USB flash drive but no files are shown on PC

SlimEddie

I have recently purchased DSO5102P and tried saving captured waveforms in CSV format to USB flash drive. Osciloscope says that CSV file was saved and shows them on osciloscope but when I connect the flashdrive to PC I don't see any files at all.
Is this a known issue and is there a fix for it?

Flashdrive is 8GB (FAT32).
Osciloscope: DSO5102P
SW version is 3.40.0 (180120.0)
HW version is 1010xffff8108