Can we increase the amount of space for the form builder?

Our company, Gallagher Staging and Productions deals a lot with large design files such as vectorworks and photoshop. We need more than 100GB, is this possbile?

We have not been using Job Form because of this issue, even though we have already set up an account

According to our current Price listing this is not possible. An alternate solution for your case might be to buy a Jotform Application License. Which can be hosted into your own servers and it will avoid the space limit.