Enabled Document Preview for on-prem files in Modern Search Center
We set up Hybrid Search (CloudSSA) so that we can point users to our Modern Search Center (sharepoint online) while we run in hybrid for next few years. But document preview does not work for on-prem files. Per Microsoft engineer, this is being worked on.
Reason : Modern Search uses different preview or microblog service which does not have the ability. Classic search from Enterprise search center has the preview ability