This Dolby doesn't have any Dolby service app, so the FX is not triggered at all..

I still don't find daxService.apk that match with this FX yet

alioth Redmi 40K

You can create PDF in Miui Gallery by installing this app: https://www.apkmirror.com/apk/kingsoft-office-software-corporation-limited/mi-doc-viewer-powered-by-wps-小米文档查看器（wps定制）/

Need to grant the storage permission manually

The PDF file will be saved to internal storage /MIUI/Gallery/PDF/

Progression today
Still in development
com.miui.securitycenter + com.miui.securityadd