Having actually set up multiple webcams on a rpi (2 each on 2 pis, costs the same as one drop cam), the most surprising thing is the power consumption. Either use a powered hub or settle for slow rates/low res. It's hard to find, as the cameras just stop working. Unless you know where to look there are no cues as to what went wrong on raspbian. That and many of the command line tools to upload to gdrive are broken by lack of maintenance, iirc the go tool gdrive was the only one that worked for me.