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This is the message Ventoy gives me when I try to boot from a USB stick with Ventoy installed and two Linux dist ISOs copied to it. With the disk mounted under Linux, a directory listing gives:

ls -al /run/media/lise/Ventoy/
total 3956224
drwxrwxrwx. 1 lise lise    131072 Dec 31  1969 .
drwxr-x---+ 3 root root        60 Nov  3 22:16 ..
-rwxrwxrwx. 1 lise lise 2007367680 Nov  3 20:21 Fedora-Workstation-Live-x86_64-34-1.2.iso
-rwxrwxrwx. 1 lise lise 2043674624 Nov  3 20:21 SL-79-x86_64-2020-10-17-LiveDVDgnome.iso

Did I misunderstand what is meant by "you just need to copy iso files to this partition"?

For completeness: in order to mount the Ventoy disk to copy the files to it, I needed to install the fuse-exfat package for RHEL. But the disk does mount, and df returns:

% df
Filesystem        1K-blocks      Used Available Use% Mounted on
devtmpfs            16417944        0  16417944  0% /dev
tmpfs              16433800        16  16433784  1% /dev/shm
tmpfs              16433800    10200  16423600  1% /run
tmpfs              16433800        0  16433800  0% /sys/fs/cgroup
/dev/sda5          275321120  19337296 241975148  8% /
tmpfs              16433800        8  16433792  1% /tmp
/dev/sdb1          480587432  44105740 412046032  10% /usr2
/dev/sda3            487634    189181    268757  42% /boot
macbookpro:/backup 488245312 488245312 218162432  70% /mac/backup
tmpfs                3286760        28  3286732  1% /run/user/1000
/dev/sdc1          120093696  3960320 116133376  4% /run/media/lise/Ventoy


The last line shows that the partition containing the iso files is the first partition on /dev/sdc. I installed Ventoy with
sh -i /dev/sdc
Was this wrong? Should I have specified something other than /dev/sdc?

Any help would be appreciated.
Solved. The filesystem type needs to be a Linux native type (I made it ext4), at least on my system Ventoy will not see the iso files if the filesystem on the USB stick is exFAT.
After install, Ventoy will dived the disk into 2 partitions. and partition 1 is formated in exfat filesystem and also is where to put the iso files.

So /dev/sdc is your USB disk, and /dev/sdc1 is partition 1 /dev/sdc2 is partition 2. Partition 2 is for internal use of Ventoy.
You just need to mount /dev/sdc1 and copy your ISO files to this partition.
If you don't use this USB disk in Windows, ext4 is OK.
Since the default is exFAT for partition 1 and many 1000s of people have no problem with Ventoy and exFAT, maybe you need to consider what may be different about your system?
'I needed to install the fuse-exfat package for RHEL. ' - a clue here ?
Did you safely eject the drive and use sync after copying the ISO files?