Global auto-upload opt-out

### Is your feature request related to a problem? Please describe.
I'm always frustrated when I am not sure whether an application on my phone is uploading files on the internet without my consent

### Describe the solution you'd like
A global toggle that completely disables any autoupload feature

### Describe alternatives you've considered
Right now, I think (but I am no sure) that the autoupload can be enabled or disabled per folder. This leaves me uneasy: I have thousands of them and no way to check if any of them is enabled

### Additional context
I keep a lot of things on my phone. I don't want that any of this ends up in the internet, unless I am explicitly adding it.