the issue was connected to a standard too strict php.ini configuration. to solve this, one has to update php.ini file setting to an higher upload_max_file_size = 2M // something more value.
In addition to the bug being reported, you might have some mileage trying the following in your wp-config.php file: define( ‘ALLOW_UNFILTERED_UPLOADS’, true ); If you’d prefer not to edit your wp-config.php file and/or you want more control over exactly which file types can be uploaded to your site, you can use the free WP Extra … Read more
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