Power off / on during usb session

My understanding is that is not possible - only when the file is run from the touchscreen as power loss recovery at startup needs to load the file from the memory on the touchscreen to continue.

Edwin used to work for Snapmaker, and this is an old official statement on the matter:

I haven’t personally tested that though. You should reach out to support and then update us with what they say on the matter, for both of your questions.