Writing to USB Stick not readable in Windows 10

I mount a USB stick (FAT32) in NomadBSD, create folder, put some files in it.
Then I unmount it, reboot into windows 10 and I can see the folder but not access it.
I get the message “K:\backup is unavailable”.
My NomadBSD install is encrypted.
Thanks for any help!

I think you need to verify some things. Is the USB key actually formatted with the FAT32 file system? Is the directory and the files within legible in NomadBSD using ls -la ? Is there any hint that something is encrypted on the USB key? Normally, I’d suggest making the sure the permissions are 755 but FAT32 does not support Unix permissions, so I’m out of ideas.