Google account - issues deleting files

My company uses a Gmail account for everything, and we have a shared folder on Google Drive linked to it. Gmail gives you 15 GB of free storage, but I've hit the ceiling and I'm almost completely out of room.
To be honest, neither my boss nor I really grasp how this all works...

So, here is the breakdown of my storage usage:


As you can see from the stats, Gmail is sitting at 3.15 GB, while the Drive side is at 11.79 GB. Here’s the kicker: the actual files I see on my Drive only add up to drive 3.24 GB, so I have no idea where those mysterious extra 8+ GB have vanished to...



I managed to dig through the Drive cloud and clear out the Trash, which helped a little, but I'm still left staring at an unexplained 5 GB surplus on the disk. Does anyone have any clue where these hidden files might be hiding or how I can actually scrub them out?

So, I’m sitting here looking at my usage, and I've finally hit a total of 7 GB used. It honestly feels like Google is taking its sweet time processing all the deletions, especially since I just finished emptying the trash folder... but hopefully, everything should be back to normal now.