THANKS A LOT IN ADVANCE 🧡
Step 1) The Items in Sharepoint Library are always like this - the field "ID" is unique

Step 2)
bring the Items into an existing Excel file ( which is stored on another folder in the Sharepoint)

WORKS GOOD SO FAR !
Problem: it is not checking if the "ID" already exist, and put it in again and again

The Flow is build up like this:
1) Recurrence : every day
works✔️
2) Dateien abrufen (nur Eigenschaften) from folder "Reparaturaufträge"
works✔️
3) Variable : Name* ID, Type:Array , Value: body/value "list of elements"
works✔️
4) Choose variable: from* body/value, map* ID = union(variables('ID'),variables('ID'))
HERE is the checking missing❌
5) For Each "body/value" >> add a row into excel file table wich is matched with every single field
works✔️
