Thanks for the suggestion! I’ve implemented support for custom date formats in the file name template.
The existing {invoice_date} placeholder will keep using the current default format (yyyyMMdd). For a custom format, you can use:
{invoice_date:dd-MM-yyyy}
So your template could be:
{invoice_type} {client} {invoice_no} - My Company {invoice_date:dd-MM-yyyy}
Small note: use uppercase MM for the month. Lowercase mm usually means minutes in date/time formatting.
This should be available in the next update.