Overcast crippling phone due to storage

My phone says storage full, and overcast downloads total about 40gb. Whenever I try to delete the downloads, the counter goes down, but when leaving settings, the storage is never freed. Ever since the app is stuck syncing (something).

I’m afraid I’ll have to delete the entire app to free the storage and this will be the final nail in the coffin of bugginess - I won’t reinstall, which leaves me quite sad as an early customer.