I have loaded various collections of sample 100k to 3 megs and it takes a while sometimes crashes but on average I get 100 samples on at a time.

each time I tell it which folder to go to and I place each group of samples in different files and then say upload here.

in C6 I select all files and in config setting set:

Use SDS Handshake ON
Use Extended SDS On
Send SPS-1UW Name Off

set Rec Format to WAV

In the main window L+R

My files are all WAV files with different Bit/Sample Rates