can a workflow in knime ask user for input at the start of the execution of a workflow and with t...

Hey all,

I hope to start my workflow with a popup asking which xlsx-file and tab the workflow can use. On the interweb i see a lot of references to widgets yet if i place one such widget (file chooser, file upload, local file browser) and I press start it doesnt work; it complains that it needs input. Im hoping to give it input in a popup but yeah no popup…

I have the feeling im missing something very basic knowledge here yet i cant find a clue with google.

Does anybody knows how to start a workflow with a popup requesting to choose a xlsx?

Thanks in advance for your reply!