Is it possible to load 2 base maps in Qfield (both of the 2 rasters are in geopackage format), and choose wich one I want to see and maybe switch during the field work ? I tried with the map themes but it does'nt seems to work with rasters.
It seems that I found the solution here: No sync geopackage raster layer to QFIELD ! Even if I checked the option "relative path" in the project properties in QGIS, it seems that QFIELDSync still exported my project.qgs with absolute paths for rasters. I try to explain how I did it: I opened my "project.qgs" directly in the mobile folder with notepad, and changed all the paths coresponding to my computer folders with the paths of my mobile folders (replace by "./raster.gpkg"). At this time it work for me !