Can't get output beyond 20 list items

I have been struggling for days to get CGPT ($20/mo paid account) to provide a summary document for a categorization task of about 400 short (<150 words) of text. From what I can tell, it categorizes the data as desired, but despite repeated requests, including the breaking of the output into small files of 50 items, say). It doesn’t produce any downloadable output, but keeps promising to do so soon, but never, ever does. Driving me nuts. I swear the output is less than 2MB total, but I can’t even get it to output a csv file with the key information.
I found a similar post (which I can’t link to, but you can search for “Output Limit of 600 Tokens?”) but no responses.

What am I missing here? Is there really a 600 token limit? WTF? Do I need to switch to using an API