Can we fill *.pdf in File Identifier on Get file metadata

Sir,

I'm a rookie of Power Automate, so i'm tried to created flow to automatic fill metadata column in SharePoint Library as below.

So, if i have specific file identifier, the flow was running successful, but if i have fill *.pdf then the flow was running fail.

In fact, i cannot specify file identifier was uploaded in SharePoint but this flow must run automatically.

My question is how to fix on this an issue?

Many thanks for advice.

Sonchai M.

Flow Running fail