How I can put file path in a bottom of each page of word file?

If you want to put automatic file path in every page of word file.  Then open a word file
and go to INSERT

 button  then FOOTER

and click blank FOOTER

and go to QUICK PART
and then FIELD 

 option click and select FIELD NAME

 option select FILE NAME and tick mark ADD PATH TO FILE NAME.

Open word file and go to INSERT >> FOOTER >> BLANK FOOTER >> QUICK PARTS>> FIELD >>  Select FIELD NAME >> FILE NAME >> Tick mark ADD PATH TO FILE NAME

If you face any problem then see this video