PDF Thumbnail preview in Shared Hosting

Hello I’m new here, I just installed Nextcloud via Softaculous and I have seen that PDF previews (Thumbnail) aren’t working as demo. I’ve been searching for a solution but all is about “Docker” or “Snap” and that is via VPS I think. How can I resolve this problem in my shared hosting?

Thanks in advance

The administrator guide describes the preview generation feature in detail. One important note is e.g.

 * The following providers are disabled by default due to performance or privacy
 * concerns:
 *  ...
 *  - OC\Preview\PDF
*  ...