WinCC Flexible scripting

It sounds like you want to log to USB1, then log to USB2. The answer is you can't. The only way I can see is if you log to SD Card, then switch to logging to USB.

You would create 2 logs, one for SD card and one for USB. You would use a bit to enable logging to SD card, and a different bit to enable logging to USB storage. For example, after plugging in the USB, you can have a button on the screen pressed to activate the bit to log to USB.

See this link on how to detect if the storage device is ready for logging:

https://support.industry.siemens.com/cs/document/89855157/how-do-you-use-a-script-to-determine-whether-a-storage-drive-with-removable-media-(usb-stick-sd-mm-card)-is-ready-for-writing-on-an-hmi-device-?dti=0&lc=en-US

With Scripts you can also exced the maximum events on the click of a button for example.

It allows a maximum of 12 events iirc.

But you can make a VB script and do the events inside the script and then call the script in the button click.

It will execute all the events.