Not working

Thanks for reporting. Turns out there is a bug when a file field is inside a hidden group.

This will not work (throws 500 ERROR server side):

[text a]
[group g]
  [file file-2]
[/group]
[submit]

https://conditional-fields-cf7.bdwm.be/form-tester/?test-form=Github+issue+92+%281%29

Temporary workaround for now:

Change file fields inside group to required file fields, like this:

[text a]
[group g]
  [file* file-2]
[/group]
[submit]

https://conditional-fields-cf7.bdwm.be/form-tester/?test-form=Github+issue+92+%282%29

Then it will work.