Please enable mobile map packages to use custom, basemap tile packages. For clarification, basemap tile packages (TPK files) stored outside of the mobile map package (MMPK) in Field Maps.
As of 13Jan25, it looks like feature layers (local or hosted) can be added to mobile map packages which can be hosted in AGO or sideloaded. However, the mobile map package can only store one imagery layer as a basemap. We have several basemap raster layers (i.e. NAIP, hillshade, canopy height model, etc.) we use with web maps for Field Maps, which are sideloaded as TPK files. Most of our AGO storage is static data. We most frequently collect "waypoints" (points) and "tracklogs" (lines) data that we sync to AGO for use in ArcGIS Pro. The ability to switch custom basemaps with a mobile map package would allow us to sideload the static vector data rather than store it in AGO.
Thanks!
Lance
