I've just install a new joomla configuration 5.3.2 on winamp server 64 PHP 8.1.31. SQL database is clean, only joomla data no other table. I'have installed SPPage buiderpro 5.7.1 and i have the same issue when trying to upload with an error message status code 400.
/joomla/administrator/index.php?option=com_sppagebuilder&task=/editor.media:1 Failed to load resource: the server responded with a status of 400 (Bad Request)
bundle.min.js?28fcdefe8a87593f1f43b7d9951e0cba:2 Uncaught (in promise) Object
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