When I'm saving a new layer made in QGIS (v 3.14), it gives me only an option of saving it as .gpkg file. I sent these to a person using ArcMap for further work and he's insisting that I send him all (.shp, .dbf, .shx, .prj, .sbn, .sbx). I have used ArcMap before, but within last year I have access only to QGIS.
Is it possible that ArcMap cannot open .gpkg file or there is something else that is the problem?