If you select the folder itself Opus will copy everything in it, including hidden files (unless you're using a Copy Filter to exclude things).
If you go into the folder and manually select files to copy, Opus will only copy the things you select.
Your answer does not help. I am copying the folder and it is not copying
the hidden file. If I do the exact same copy with Windows Explorer it copies the hidden file correctly.
The folder is on a mapped network drive and I am not using any filters in Opus. Unless there is something set by default to not copy hidden files.
So what do you need from me to show you that it is not working correctly?