Uploaded file to Media but then lots of Error messages

I’ve tried several times to upload an mp3 file (13Mb file size) to my media library. At first, the uploader gave the error message that the upload limit was 2Mb and recommended I contact my hosting provider. This was confirmed by several ‘file upload size changer’ plugins which did not work for the same reason, so I ununstalled them and contacted my sevice provider. After some to-ing and fro-ing, they set the limit to 64Mb. So far, so good.

But then I tried to upload the file again, and while it didn’t complain about the file size this time, it did complain about something about headers already being uploaded. And of course, no file upload happened.

Well, here are the error messages that it gave:

Maximum upload file size: 64 MB.
Crunching… (this is a blue button that doesn't work)

Warning: POST Content-Length of 13918591 bytes exceeds the limit of 8388608 bytes in Unknown on line 0

Warning: Cannot modify header information - headers already sent in /home/www/www.flyinginthespirit.cuttys.net/wp-admin/includes/misc.php on line 1381

Warning: Cannot modify header information - headers already sent in /home/www/www.flyinginthespirit.cuttys.net/wp-includes/functions.php on line 6878

Warning: Cannot modify header information - headers already sent in /home/www/www.flyinginthespirit.cuttys.net/wp-admin/async-upload.php on line 25
The link you followed has expired.

Please try again.

—-

Of course, trying again doesn’t help either.

Any ideas, please?

Using WP version 6.0.2 with PHP 8.0.

 

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