Here’s why it’s important to see if you can figure out what is causing the problem, rather than just adding/buying more data - one of my daughters is already nearly out of data again. She had assured me she had closed all her Chrome tabs, but apparently, something is still consuming a lot of data.
When I open the Chrome app on my phone, here’s what I see and where I’d start.
(Open Chrome, tap the three-dot icon, then Settings)
First, my “Sync” settings are enabled. I tap “Sync is on” and see that it’s syncing “open tabs.” Maybe that’s a problem? I’m turning that one off. I don’t need the same tabs open on my phone that are open on my computer.
I hit the “Back” arrow to view settings again, and the next thing that catches my eye is under “Advanced” - “Site Settings”. I tap that and see “Background sync” is allowed. I’m turning that off. It’s a tool that Chrome uses to allow other apps (which are actually using Chrome behind the scenes) to complete actions later if you don’t have good internet access when they first try to do so. I’m a little skeptical that this is limited to actions I’m intentionally initiating. Maybe later I’ll change this back if I start seeing some issues in other apps because I have it turned off, but for now, I want to be in control of how and when my data is being used.
The “Automatic downloads” setting is set to "ask first’ on my phone. I’ll be checking that on my daughter’s phone, and you may want to check it on yours.
I’m not seeing the “auto-play” setting in Chrome that @Majorninth suggested, maybe he can chime in with some steps to help us both find it.