I have the ODOO10CE
with many PDF attachments. Most are linked to accounting entries and invoices.
Can someone recommend me how to transfer them to ODOO14CE
and re-link them to the accounting entries and invoices?
Thanks.
If you have already successfully upgraded your database from 10 to 14 and the only thing still outstanding is your attachments, then you should simply move your filestore as you would move any set of folders.
It seems... unlikely... that you would have successfully upgraded from 10 to 14 without knowing this however so maybe there's more to the question than I'm seeing?
For general knowledge, check out the Odoo 14 Documentation on importing documents: