You can make use of 'Quick Edit' to edit the data of multiple files at once. Please note that any files you're attempting to change need to be 'Checked Out' to you. Filenames on Fulcrum need to correspond to the existing filename-format in order for them to be accepted by the system.
1. Click on the ‘Quick Edit’ button. This will open an inline edit view of the filenames list.
2. Fill in/ modify the fields.
3. Click ‘Stop’ (editing this list). The list will then display the modified data.