German phrase
In welchem Dateiformat soll ich ~ einreichen?
Meaning
Which file format should I submit ___ in
When to use it
It asks which format to use. This politely checks the required submission format.
Example dialogue
In welchem Dateiformat soll ich meine Bewerbungsunterlagen einreichen?
Which file format should I submit my application documents in?
Am besten per E-Mail als Anhang im PDF-Format.
Preferably as a PDF attachment by email.