Excuse me, can I put my baggage at Nanpu Station in Osaka, Japan? Where is it? thank you

Whether it's a subway or a tram, there are luggage lockers near the entrance, probably near the central exit, but the biggest one is not very big. You know, rows of cabinets. It costs money. And there is a time limit. You can go and see if there is a bigger cupboard. There are usually large subway stations. If you can't find it, ask the clerk. Prepare small change, 100 yen. Make more preparations.