Can map files (.mapx) saved using ArcGIS Pro 3.x be imported by previous versions of ArcGIS Pro 2.x?
Are you trying to use these files in a custom print service?
No. Our users send us .mapx files to import into our Enterprise .aprx for publishing for enterprise user use.
No.
https://pro.arcgis.com/en/pro-app/latest/get-started/migrate-2x-to-3.htm#ESRI_SECTION1_3B4A98CA20D14...
Map, layer, reports, and layout files (.mapx, .lyrx, .rptx, and .pagx files) cannot be opened in 2.x once they are created or saved in 3.x.
