download all supplier invoices scan copy in batch

I need to download every month all the scan/pictures of my suppliers invoices which are attached in the supplier invoice page under attached docs.
I can’t find the procedure.
anyone can help ?
thanks

I scan and upload all supplier invoices in the supplier invoice attachment tab.
but I would like to download for a given month all the suppliers invoices in one batch . I am sure there is a solution but I can’t find where it is.
thanks for your help
Jacques

Not sure if there is an easy way run this batch in Dolibarr or Linux but you can always create a PhP script then setup a cron job to compress /documents/fournisseur/facture files each month.