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Hello.
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I have the same problem with implementation of file duplicate validation check in Chronoforms v5, and I managed to resolve it (more about in topic Avoid file upload duplicates).
Now I must migrate that form from CF 5 to CF 6, and I have managed to setup everything except file duplicate validation.
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Is there a someone who can tell me how can I setup file duplicate validation?
I'm using 4 file upload elements in my form, and I will like to prevent user to upload files with the same names.
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Thank you in advanced.

You better do this with PHP, use a PHP action, return true or false after you do the check, then use IF Conditions action and redisplay the form if the PHP returns false.
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The code can check the $_FILES array for files names.
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Best regards