Hello!
I am working in an area with a poor mobile data connection. My survey has a large raster layer (which I want to make available offline) and vector layers (which I want to be online).
I created a Web Map with the vector layers. And I saw in settings that I can specify a Tile Package on my mobile device as the basemap (screenshot below). I created a tpkx of the raster image, and sideloaded it onto my Android device.
I've also created the Offline Map Areas for the Web Map. After I download the Offline Map Area in Survey123, the Tile Package still does not appear as a basemap.
The process is working in Field Maps. Just not in Survey123. (The sideloaded tpkx file is available to load by itself. But this is not a solution because I need the online vector layers also)
I imagine others have encountered similar scenarios, and any guidance would be greatly appreciated!

I've been referencing the following, but I have not yet found a solution:
https://doc.arcgis.com/en/survey123/desktop/create-surveys/preparebasemaps.htm
https://enterprise.arcgis.com/en/portal/11.1/use/take-maps-offline.htm