diff --git a/src/libslic3r/Format/bbs_3mf.cpp b/src/libslic3r/Format/bbs_3mf.cpp
index 6e756370a4..9e4666e92f 100644
--- a/src/libslic3r/Format/bbs_3mf.cpp
+++ b/src/libslic3r/Format/bbs_3mf.cpp
@@ -7453,7 +7453,8 @@ bool _BBS_3MF_Exporter::_add_auxiliary_dir_to_archive(mz_zip_archive &archive, c
                     data._3mf_thumbnail = dst_in_3mf;
                 } else if (m_thumbnail_small.compare(1, m_thumbnail_small.length() - 1, dst_in_3mf) == 0) {
                     data._3mf_printer_thumbnail_small = dst_in_3mf;
-                } else if (m_thumbnail_middle.compare(1, m_thumbnail_small.length() - 1, dst_in_3mf) == 0) {
+                    if (m_thumbnail_middle == m_thumbnail_small) data._3mf_printer_thumbnail_middle = dst_in_3mf;
+                } else if (m_thumbnail_middle.compare(1, m_thumbnail_middle.length() - 1, dst_in_3mf) == 0) {
                     data._3mf_printer_thumbnail_middle = dst_in_3mf;
                 }
                 result &= _add_file_to_archive(archive, dst_in_3mf, src_file);
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 97617a8b78..883c47fbc7 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -10805,7 +10805,7 @@ int Plater::send_gcode(int plate_idx, Export3mfProgressFn proFn)
         return -1;
     }
 
-    SaveStrategy strategy = SaveStrategy::Silence | SaveStrategy::SkipModel | SaveStrategy::WithGcode | SaveStrategy::SkipAuxiliary;
+    SaveStrategy strategy = SaveStrategy::Silence | SaveStrategy::SkipModel | SaveStrategy::WithGcode;
 #if !BBL_RELEASE_TO_PUBLIC
     //only save model in QA environment
     std::string sel = get_app_config()->get("iot_environment");
diff --git a/src/slic3r/GUI/Printer/PrinterFileSystem.cpp b/src/slic3r/GUI/Printer/PrinterFileSystem.cpp
index e4ae0756f7..c47fec5cc1 100644
--- a/src/slic3r/GUI/Printer/PrinterFileSystem.cpp
+++ b/src/slic3r/GUI/Printer/PrinterFileSystem.cpp
@@ -866,6 +866,7 @@ void PrinterFileSystem::UpdateFocusThumbnail2(std::shared_ptr<std::vector<File>>
                     size = iter->local_path.size();
                 }
                 wxMemoryInputStream mis(data, size);
+                mimetype.Replace("jpg", "jpeg");
                 file.thumbnail = wxImage(mis, mimetype);
             }
             file.name = thumbnail;