ChatGPT saying Unknown Error Occurred for File Uploads

Go user. I was working on the project and encountered this error about 30 minutes ago while uploading a PDF (with no image content). I changed browsers, cleared the cache, tried another PDF, reprinted as suggested, deleted the session containing the same PDF, tested with the free version, used the desktop app, and changed the filename, all to no avail. If this continues until the evening, I will have to cancel my subscription.