I'm on a long bus ride & brought a portable charger that has worked great with my old iPhone. I plugged my Moto Z in it & the screen twitches like it recognized something was plugged in. The battery acts like it's working but it's not charging. It's the same USB- C type cable I use to charge it on my PC. I recently got some help from a great member of this forum about why I can't access my Moto folders when plugged into PC. They said to look for my "USB Notification" settings. I Googled this charger problem & I also get the same USB suggestions. I can't find anything or anywhere on my phone the deals with "USB Notification". I checked status menu & setting/ notifications with no luck. What am I doing wrong?