When mounting USB storage via OTG cable then the notification "Preparing USB Storage, please wait" pops up as window on the screen, not on the notification bar. In this case the phone acts as USB host.
In the past when my phone could be connected as mass storage to a PC, I think it was the same notification on the notifiaction bar when I disconnected and then phone mounted its external SD card.
The phone as mass storage for a PC means the SD card is unmounted on the phone and mounted on the PC.
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