'What's the difference in serving file through express and through public html folder?

What's the difference between those two:

Public video file headers

and

nestjs/express headers

First file is put in public html folder I've checked it's headers and as can I see:

Content-Type, Content-Length, Connection, Accept-Ranges are the same.

But... for file put in html folder I can use it's link for twitter's card and i can see video preview, and for file returned by nestjs backend it's not shown there.

Both pages got their required meta tags and are served over https.

htmlnode.jsexpressnginxnestjs


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