Added max list size circumvention for file transfers between sites.

SharepointToolbox/Services/SystemGroupTargetResolver.cs

@@ -42,6 +42,7 @@ public class SystemGroupTargetResolver : ISystemGroupTargetResolver
                 _ => null
             };
         }
+        catch (OperationCanceledException) { throw; }
         catch (Exception ex)
         {
             Log.Debug("System group target resolution failed for {Kind} on {Site}: {Error}",
@@ -97,7 +98,7 @@ public class SystemGroupTargetResolver : ISystemGroupTargetResolver
                 return new SystemGroupTarget(SystemGroupKind.SharingLink, file.Name, url, linkType);
             }
         }
-        catch (ServerException) { /* fall through */ }
+        catch (ServerException ex) { Log.Debug("File by ID not found for {Id} on {Site}: {Error}", itemUniqueId, ctx.Url, ex.Message); }
 
         // 2. Try as folder on current web.
         try
@@ -109,7 +110,7 @@ public class SystemGroupTargetResolver : ISystemGroupTargetResolver
             var url = BuildAbsoluteUrl(ctx.Url, folder.ServerRelativeUrl);
             return new SystemGroupTarget(SystemGroupKind.SharingLink, folder.Name, url, linkType);
         }
-        catch (ServerException) { /* fall through */ }
+        catch (ServerException ex) { Log.Debug("Folder by ID not found for {Id} on {Site}: {Error}", itemUniqueId, ctx.Url, ex.Message); }
 
         // 3. Search-index fallback — covers items moved to a different subsite or
         //    deleted recently (the index may lag the deletion by minutes/hours).
@@ -168,6 +169,7 @@ public class SystemGroupTargetResolver : ISystemGroupTargetResolver
                 path,
                 linkType);
         }
+        catch (OperationCanceledException) { throw; }
         catch (Exception ex)
         {
             Log.Debug("UniqueId search fallback failed for {Item} on {Site}: {Error}",