Using ASIAir Mini, Android Phone, Sony A6000 Camera, Samsung FIT Plus 128GB USB Stick.
I get everything set including setting storage to the USB Stick, and start an autorun of maybe 100 images. After about 20 images, a dialog pops up on my phone: "HINT: Switch storage to USB Drive No or Switch" (Its already set to USB Drive) No matter whether you select "No" or "Switch", you get an error message that autorun has stopped. Clicking the autoun start button after that results in "Exposure Failed".
The only way to get started imaging again is to disconnect the camera, reconnect and start over. The error is 100% repeatable.