There are use cases where the apps have to be used together, however, there are no tutorials and extensive documentation on how to do this in different scenarios. As as result, often times you get directions from community post comments. So. it would be helpful to have thorough documentation and tutorials on this, thank you.
One thing Google shows is the following which is not very well detailed.
https://doc.arcgis.com/en/survey123/get-started/integratewithotherapps.htm
