Something was happening on one of my websites. My website had an error and when I turned on Debugging, the PHP error was coming from the otter-blocks plugin. In my case, when I reverted back to version 1.6.4 by manually uploading that version of the plugin, that solved the problem. My WordPress core is still on version 5.6.4.
You can add to your config.php file the following lines to save the FTP values:
// ** FTP SETTINGS FOR AUTO-UPDATE ** //
define(‘FTP_HOST’, ‘YOUR-HOSTNAME-HERE’);
define(‘FTP_USER’, ‘YOUR-FTP-USERNAME’);
define(‘FTP_PASS’, ‘YOUR-FTP-PASSWORD’);
Then it will remember permanently.