Severance and unemployment, do they overlap? - any advice?

My employer is paying severance in instalments and I am not sure whether to file now. I worked as an insurance claims processor before this. I have a mortgage and need to plan. How did your state treat it?

I filed on day one anyway and reported the severance honestly. The agency decided what to do about the timing.

Some states only count certain kinds of severance. A local workforce centre could tell me which.