Opus itself doesn't store any connection details; it's all handled by Windows.
If you see different results in File Explorer and Opus:
- Make sure Opus is not running elevated. See Why NOT to run Opus as Administrator under UAC
- (Similarly, if Opus is being launched under a different user account, it can cause differences. This is very rare, so you'll know if you're doing it.)
- Try File > Exit Directory Opus (don't just close the window) and then restart it to see if that helps.
- Antivirus / firewall software may be treating Opus and File Explorer differently.
- The remote server, if it's not a Windows machine, may have bugs that are triggered when Opus does things which File Explorer doesn't do, e.g. looking for label information or trying to update permissions when copying.