Why does a web map taken offline have a different itemID than the online web map?

[esri]

Why does a web map taken offline have a different itemID than the online web map?

[esreli]

I've written Antti & am awaiting a response.

[esreli]

From Antti:

yes it has. when we take it offline it gets new id but you can find the original from localItem.OriginalPortalItemId

assuming thats what you want to do

[esreli]

It appears Antti's suggestion has not been implemented in iOS:
https://developers.arcgis.com/ios/latest/api-reference/interface_a_g_s_local_item.html

Whereas it has been implemented in Android SDK:
https://developers.arcgis.com/android/latest/api-reference/reference/com/esri/arcgisruntime/mapping/LocalItem.html#getOriginalPortalItemID()

[esreli]

localItem.OriginalPortalItemId has been introduced into the SDK and implemented. It works as expected.