Copy: rename and append greyed out

[Fufurro]

Hello! I'm using multicommander for quite a while now, and I just noticed that in the copy/overwrite popup the options to rename and append files are greyed out.
Is there a setting that I can change to enable these functions?

I'm using the latest version on Windows 10.

Thanks in advance!

[Mathias (Author)]

Normally they are enabled. But depends on device type of source and target volume