Multiple File Upload - File Upload Widget and File Chooser Widget

Hi,

KNIME AP 4.6.2

KNIME Server 4.15.1

I currently try to create a component for a workflow running on a knime server based on: https://kni.me/w/xswv3kaw2K-ybXsU

First Problem: I use the combination of Refresh Button and File Upload widgets to load multiple files by writing each file to a temporary folder using the CSV writer. This actually works until I click the “Close and Apply temporarily” button. Which results in a duplication of my uploaded data. I still cannot find a mistake in the logic on how I connected the nodes. Is it possible that upon “Close and Apply temporarily” the Component is executed one more time? This would explain the duplication. If yes could one prevent this behaviour?

I tried the “File Chooser Widget” on the local AP as well as on the server but it does not seem to work for me (I even downloaded a workflow from the hub) - see the picture below. Do I miss something using this widget or is there a bug in the current version?

Is there an update on the current “Multiple File Upload” topic (I saw several forum entries on this matter) with a straight forward solution? This really is essential.

Many thanks in advance.