I'm invited to a lot of "meetings that should be emails". I'm currently doing a lot of unpaid overtime because of, among others, that. I have a list of tasks to complete. In a typical workday I can't start even one of them since I spend time in not necessary meetings planned with a very short notice.
So colleague Sam (my peer) schedules a meeting in 4 hours with title "Current situation" or "Project - next steps" or something similarly vague. No description.
I've no idea what the meeting is to be about and judging by who proposed it there's a huge chance he didn't invite the right persons or he will want me to "explain him AWS" (he has a non-technical role on a technical project. He wants to be explained a lot of technicalities).
When I ping him and ask what the topic of the meeting is, he says, he wanted to get diagram A and ask about the process for B. I say: "Let me send you the diagram. I haven't even started designing a process for B, so I really can't say anything about it". I propose that we cancel the meeting if that's all.
He accusses me of not being a team player and working in silos.
How should I cover my ass in this case? I'm trying to help everyone, but my workload is currently unbearable and useless meetings that shouldn't happen contribute to that.