Extract raster from FileGDB
FileGDB is a proprietary file format that has limited functionality outside of Esri software. QGIS and other open-source software may be able to read vector layers thanks to GDAL's OpenFileGDB driver, but cannot read raster layers.
The following video demonstrates how to use ArcMap to extract rasters from a FileGDB and save them to a GeoTIFF file that can be used in QGIS and other software.