"Sorry, there was an error uploading your file."

Please advise on the below error: “Sorry, there was an error uploading your file.” I’ve unpacked files to the server and set my API key. When viewing index.php, selecting file and clicking submit the error occurs.

If you test the connection with Postman, do you get the same result?

You probably know it, but just in case: Postman is a free app, see https://ocr.space/ocrapi#postman

If you see the problem even with Postman, a screenshot of the result could be helpful.