I create a mobile map package using ArcGIS Pro 2.1. I upload my MMPK file to my portal, I sign in to my portal using Explorer for ArcGIS 17.1.2 for IOS 11.2.5 . I download my mobile package to my device with no problem.
but when I try to open my mobile package in the app, i get an invalid json error.
I open my mmpk in ArcGIS Pro with no problem.
Any idea what could be happening?