After uploading the new certificate via Plesk UI an old certificate is shown in browser for the website https://www.example.com.
In Plesk and in IIS the new certificate is assigned.
Cause is unclear. Probably an old certificate file is cached in IIS.
2. Navigate to tab Home > Domains > example.com > Hosting settings.
3. Disable option SSL/TLS Support and click Apply.
4. Re-enable option SSL/TLS Support and click Apply.