diff --git "a/pages/0_\360\237\223\201_File_Upload.py" "b/pages/0_\360\237\223\201_File_Upload.py"
index 46bee9d..6ca3df6 100644
--- "a/pages/0_\360\237\223\201_File_Upload.py"
+++ "b/pages/0_\360\237\223\201_File_Upload.py"
@@ -10,6 +10,9 @@
 
 st.title("File Upload")
 
+if "selected-mzML-files" not in st.session_state:
+    st.session_state["selected-mzML-files"] = params["selected-mzML-files"]
+
 tabs = ["File Upload", "Example Data"]
 if st.session_state.location == "local":
     tabs.append("Files from local folder")
diff --git a/src/common.py b/src/common.py
index b12081e..fdf6d7b 100644
--- a/src/common.py
+++ b/src/common.py
@@ -202,6 +202,9 @@ def render_sidebar(page: str = "") -> None:
             elif st.session_state.location == "local":
                 # Define callback function to change workspace
                 def change_workspace():
+                    for key in params.keys():
+                        if key in st.session_state.keys():
+                            del st.session_state[key]
                     st.session_state.workspace = Path(
                         workspaces_dir, st.session_state["chosen-workspace"]
                     )