Step 1: Start SPMT, and then enter your Microsoft 365 username and password.
Step 2: Select Start your first migration.
Step 3: Select JSON or CSV file for bulk migration.
Step 4: Enter the full path of your .CSV or .JSON file where your content is located, and then select Add.
Step 5: Enter the URL of the SharePoint site where you want your files migrated, and then select Next.
Step 6: Select JSON or CSV file for bulk migration. Enter the location of your file, or select Choose File to locate it. Select Add.
Step 7: If you want to select another set of data files to migrate, select Add a source; otherwise, select Next.
Step 8: Review your settings, and the select Migrate.