Symptoms
Plesk Obsidian running on a Linux-based operating system
The screenshot thumbnail in Plesk > Domains > example.com is not updated automatically after uploading any content and looks like it's loading indefinitely:
(https://pix.cobrasoft.org/images/2023/12/20/mceclip0.png)
Cause
This issue is tied to a known bug with ID #PPPM-14221 Websites preview doesn't load which will be resolved in future versions of Plesk.
You may view the changelog on the following link in order to check if the bug in question has been resolved permanently:
Change Log for Plesk Obsidian
Resolution
As a workaround, you could open the domain via your browser (or by using an online proxy).
Alternatively, you could follow these steps:
1. Log into Plesk
2. Go to Domains > example.com
3. Hover over the website thumbnail with your mouse and press Preview
This would allow you to view the website in its current state via the Plesk website preview function