Why is it that an Android Bluetooth file transfer says it was successful, but the videos are not found?

I recently transferred two videos from a Samsung Android phone to my Oppo Reno 4 using Bluetooth. The transfer took a few minutes, and I received a notification confirming that both videos were successfully received (2 successful, 0 failed). However, when I checked the Oppo device, the videos were nowhere to be found—neither in the gallery nor in any file manager. I’m not looking for a fix, just trying to understand: is this a known issue on Android? What could explain a successful transfer notification followed by missing files? I ended up re-sending the files, which worked the second time, but having to wait again was frustrating.