diff --git a/Mergin/validation.py b/Mergin/validation.py
index 0853a6c0..290f02aa 100644
--- a/Mergin/validation.py
+++ b/Mergin/validation.py
@@ -194,8 +194,10 @@ def check_offline(self):
         """Check if there are layers that might not be available when offline"""
         w = MultipleLayersWarning(Warning.NOT_FOR_OFFLINE)
         for lid, layer in self.layers.items():
+            print("\n", layer.name(), layer.source())
             # special check for vector tile layers because in QGIS < 3.22 they may not have data provider assigned
             if layer.type() == QgsMapLayerType.VectorTileLayer:
+                print(" - vector tile")
                 # mbtiles/vtpk are always local files
                 if "type=mbtiles" not in layer.source() and "type=vtpk" not in layer.source():
                     w.items.append(layer.name())
@@ -203,6 +205,7 @@ def check_offline(self):
 
             dp_name = layer.dataProvider().name()
             if dp_name in QGIS_NET_PROVIDERS + QGIS_DB_PROVIDERS:
+                print(" - net/db", dp_name)
                 # raster tiles in mbtiles are always local files
                 if dp_name == "wms" and "type=mbtiles" in layer.source():
                     continue