File paths for the invoices were using the old system - in Contao 3 only the id for the file is saved in the database, not the filepath.
Some modules were using a hardcoded /items/ URL. In Contao 3 there is a "useAutoItem" option to omit the "/items/" part of the URL.
File paths for the invoices were using the old system - in Contao 3 only the id for the file is saved in the database, not the filepath. Some modules were using a hardcoded /items/ URL. In Contao 3 there is a "useAutoItem" option to omit the "/items/" part of the URL.