Covering Page for Proposals and invoice

Using my Dolibarr PM modules
,
1

I would like to add a cover page to each the proposals and invoices. the page is available as a PDF and I want to include this PDF in front of the generated Proposal or Invoice.

2

see my answer here

InfraSpackPlus also allows to concatenate several pdf, i.e your covering page+your proposal or invoice, if you need to have them in one single pdf file

3

As far as I know, you need a separate platform for that.