Unable to build a basemap from several GeoTIFFs

[tannenfreund87]

Describe the issue

I have multiple GeoTIFFs (CIR-Images) as background to my areas of interest in my project. I want to use them as a joint background (aka. basemap) in my Qfield-project. But they don't get converted.

Reproduction steps

Steps to reproduce the behavior:

1. Make a project with multiple GeoTIFFs
2. Configure a Map Theme with all of them visible
3. Open: "Plugins > QFieldSync > Configure Current Project"
4. Tick "Base Map", select configured Map Theme
5. Apply settings and close dialog

Expected behavior

QField generates a base map using my map theme, to be displayed in the background and the other layers on top of it.

Observed behavior

While packing for QField, I get this error message: "No basemap layer selected. Please check the project configuration."

Screenshots and GIFs

The different raster backgrounds

Desktop (please complete the following information)

QGIS version | 3.32.1-Lima | QGIS code revision | 4a078ecf
Qt version | 5.15.3
Python version | 3.9.5
GDAL/OGR version | 3.7.1
PROJ version | 9.2.1
EPSG Registry database version | v10.088 (2023-05-13)
GEOS version | 3.12.0-CAPI-1.18.0
SQLite version | 3.41.1
PDAL version | 2.5.5
PostgreSQL client version | unknown
SpatiaLite version | 5.1.0
QWT version | 6.1.6
QScintilla2 version | 2.13.1
OS version | Windows 10 Version 2009

Active Python plugins
chm_from_lidar-master | 0.10
DigitizingTools | 1.5.2
LAStools | 1.4
LidarManager | 0.9.10
lidar_tile_maker | 0.2
qfieldsync | v4.5.0
SpreadsheetLayers | 2.1.0
TerrainShading | 0.9.4
db_manager | 0.1.20
grassprovider | 2.12.99
MetaSearch | 0.3.6
otbprovider | 2.12.99
processing | 2.12.99

Mobile (please complete the following information)

• Device: Nokia XR20
• OS: Android 13
• QField version: 2.8.5 cd8dd5

Additional information

• Problem started happening recently, didn't happen in an older version of QField: [can't try out]
• Problem can be reliably reproduced, doesn't happen randomly: [Yes]
• Problem happens with all files and projects, not only some files or projects: [Yes]

[nirvn]

@tannenfreund87 , I believe this is possible by using map themes. Create a map theme with only those rasters are visible, and that should work.