How to export the Vendors Data Set from FlexiCapture for Invoices project?
There is no built-in feature in FlexiCapture that would allow Data Set export.
However, if you export a project to the local drive (Project Setup Station > Project > Export Project), you may find Data Set stored as an SQLite database file inside the project folder.
The path to the Vendors Data Set file is Templates\[DocumentDefinitionName]_Attachments\Vendors.Cache.
The Data Set is stored as a .db file. You may open it using SQLite viewer.