Local offline maps


Is it possible to tell the Maps app to use local copies of OSM maps for the base maps if Internet access isn’t available? Can I just create a new map folder under ‘My Maps’ and copy a bunch of .pbf maps into it, then switch to that map folder? I have a Raspberry Pi Nextcloud server that I’d like to use when I’m at a remote cabin with a bunch friends for a backpacking trip, and we’d like to upload and share pictures from our cell phones.