I create widget for 3D and then i use Portal for Arcgis (10.6.1) for creating aplication for 3D - works great.
But i will integrating 2D widget (API 4) with aplication created in Portal (2D app, not 3D!). Its possible? 2D app run on API 3. Is some tool for migrating from version 4 to 3? Eventually there is some possibility??
Thanks for Answer