move_uploaded_file failed to open stream permission denied

Make sure that:

1. IWPG_user, where user is a system user of the subscription who has rights to "Read", "Write" and "Modify" the %windir%\Temp directory.

2. The destination folder from the error message exists in the %plesk_vhosts%\example.com\httpdocs\directory and the system user from the previous step has similar access rights.

   Note: If the destination file is located inside a directory, these permissions must be set to the this directory as well (e.g. ./images/)

3. safe_mode and safe_mode_exec_dir ​parameters of the PHP handler are disabled.

   It can be checked on the phpinfo() page of the domain: Plesk > Domains > example.com > PHP Settings > View the phpinfo() page.

   If one of options is enabled, disable it by adding a corresponding value in the additional directive at Plesk >Domains > example.com > PHP Settings > Additional configuration directives, for example:

   safe_mode_exec_dir = Off