diff --git a/LeStorage/StoreCenter.swift b/LeStorage/StoreCenter.swift
index 40e6106..3fe6302 100644
--- a/LeStorage/StoreCenter.swift
+++ b/LeStorage/StoreCenter.swift
@@ -378,6 +378,7 @@ public class StoreCenter {
     ///   - instance: an object to insert
     func sendInsertion<T: Storable>(_ instance: T) async throws -> T? {
         guard self._canSynchronise() else {
+            StoreCenter.main.log(message: "cannot send insert: \(T.resourceName()), \(StoreCenter.main.userName() ?? "no user")")
             return nil
         }
         return try await self.apiCallCollection().sendInsertion(instance)
@@ -388,6 +389,7 @@ public class StoreCenter {
     ///   - instance: an object to update
     func sendUpdate<T: Storable>(_ instance: T) async throws -> T? {
         guard self._canSynchronise() else {
+            StoreCenter.main.log(message: "cannot send update: \(T.resourceName()), \(StoreCenter.main.userName() ?? "no user")")
             return nil
         }
         return try await self.apiCallCollection().sendUpdate(instance)
@@ -398,6 +400,7 @@ public class StoreCenter {
     ///   - instance: an object to delete
     func sendDeletion<T: Storable>(_ instance: T) async throws {
         guard self._canSynchronise() else {
+            StoreCenter.main.log(message: "cannot send delete: \(T.resourceName()), \(StoreCenter.main.userName() ?? "no user")")
             return
         }
         try await self.apiCallCollection().sendDeletion(instance)
diff --git a/LeStorage/StoredCollection.swift b/LeStorage/StoredCollection.swift
index 4c6165d..e04650c 100644
--- a/LeStorage/StoredCollection.swift
+++ b/LeStorage/StoredCollection.swift
@@ -421,6 +421,7 @@ public class StoredCollection<T: Storable>: RandomAccessCollection, SomeCollecti
     ///   - instance: the object to POST
     fileprivate func _sendInsertionIfNecessary(_ instance: T) {
         guard self.synchronized else {
+            StoreCenter.main.log(message: "cannot send insert: \(T.resourceName()), \(StoreCenter.main.userName() ?? "no user") : sync = \(self.synchronized)")
             return
         }
         Task {
@@ -429,6 +430,7 @@ public class StoredCollection<T: Storable>: RandomAccessCollection, SomeCollecti
                     self.updateFromServerInstance(result)
                 }
             } catch {
+                StoreCenter.main.log(message: error.localizedDescription)
                 Logger.error(error)
             }
         }
@@ -450,12 +452,14 @@ public class StoredCollection<T: Storable>: RandomAccessCollection, SomeCollecti
     ///   - instance: the object to PUT
     fileprivate func _sendUpdateIfNecessary(_ instance: T) {
         guard self.synchronized, self._sendsUpdate else {
+            StoreCenter.main.log(message: "cannot send update: \(T.resourceName()), \(StoreCenter.main.userName() ?? "no user") : sync = \(self.synchronized), self._sendsUpdate = \(self._sendsUpdate)")
             return
         }
         Task {
             do {
                 try await self._store.sendUpdate(instance)
             } catch {
+                StoreCenter.main.log(message: error.localizedDescription)
                 Logger.error(error)
             }
         }
@@ -466,12 +470,14 @@ public class StoredCollection<T: Storable>: RandomAccessCollection, SomeCollecti
     ///   - instance: the object to DELETE
     fileprivate func _sendDeletionIfNecessary(_ instance: T) {
         guard self.synchronized else {
+            StoreCenter.main.log(message: "cannot send delete: \(T.resourceName()), \(StoreCenter.main.userName() ?? "no user") : sync = \(self.synchronized)")
             return
         }
         Task {
             do {
                 try await self._store.sendDeletion(instance)
             } catch {
+                StoreCenter.main.log(message: error.localizedDescription)
                 Logger.error(error)
             }
         }