Hi
I am subscribed to ChatGPT4o at £20 per month and having uploade a file I keep getting told that Chat can not read it. It is a small excel file noting fancy and I have tried everything all to no avail. I have emailed support but have not heard back from them not even a received acknowledgment, can anyone point me in the right direction as I am at my wits end as to what to do and even more so at not receiving any help from support while paying £20 per month. Very disgruntled.
Kind Regards