The OSTN15 transformation is available for download easily on iOS, but cannot be downloaded on Android (others can be).
This needs to be enabled to Adndroid.
The ability to download grid-based transformations (including OSTN15) on Android is planned for a future release.
Thanks @DougMorgenthaler, is there a rough timeline on that?
Can I second that question - when will OSTN15 be available for Android users of Field Maps? How soon a future-release? Without this the application is not much use to me.
Support is now available in ArcGIS Field Maps 21.4.
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