Are you able to create a custom map to use as the basemap in your Survery123? If so, how is this done.
I've not tried this, but here is some documentation that may help
Include a map in your survey—Survey123 for ArcGIS | ArcGIS
I have used ESRI Labs Tile Package Kreator. https://community.esri.com/groups/survey123/blog/2017/01/31/taking-your-maps-offline-with-tile-packa...
Thanks! Success! Also see related question which I didn't find until after I posed: https://community.esri.com/thread/192645-is-there-any-way-to-use-my-own-basemaps-in-survey123