Can't import vector data

From the information shown I see no reason why it should not be geo-referenced in SNAP.
Is it possible that you provide the file?

gdal of SNAP : 3-0-0
QGIS: 3.1.4

it is a merged big tiff of lots of orthophotos. if I load each single DOP into the Product explorer, they are georeferenced and “import vector” works. but my training data expand over the whole number of DOPs…