BMD Studio Cam Pro Does not span file across USBC drives

I recorded on my BMD Studio Camera Pro 4K with two USBC drives plugged in and formatted.
When the first drive was full, recording showed as switched to the 2nd drive
The second drive has viewable files, but the full first drives (all 6 of them) do not open. They do not first aid repair. They do not show any files in the finder even though the get info shows that the drive space is used and has files
No program I use to view these invisible files opens or reveals them
Please help, as I have half of an event recorded on drives that have files that will not reveal in finder or open
When the first drive was full, recording showed as switched to the 2nd drive
The second drive has viewable files, but the full first drives (all 6 of them) do not open. They do not first aid repair. They do not show any files in the finder even though the get info shows that the drive space is used and has files
No program I use to view these invisible files opens or reveals them
Please help, as I have half of an event recorded on drives that have files that will not reveal in finder or open