Has been reported a few times, especially with Samsung phones but seems to impact others also. Not sure what the ETA is for a fix. Seems to affect the v4 specifically.
On other cameras, the app has been saving both a still photo and video with the same name causing the phone to get confused, I’m wondering if the two bugs are related. As far as I know the only workaround right now is to take out the SD card and copy the files off that. You could also try going back to the 2.5 app but it isn’t clear if it is an app issue or firmware issue, or some combination.