This lets you use the desktop application and a phone at the same time, which I use.

It doesn't allow you to use multiple phones at the same time.

It's something I've just recently run into trying to set it up on an Android tablet. The funny thing is they allow it on an iPad. It'd be great if they allowed just any phone or tablet to link to the primary device. I'd complain but it's been deaf ears for the last 4 years to get them to put gifs back into the desktop app.

Thanks I didn't know that