When sending multiple items it takes too long to process the individual confirmation on the WMS-app.

My suggestion is to change the individual put-away into a Group put-away for the picked batches. Now you need to click and confirm each picked item to finnish the work. Idea is that the forklift driver can see on the WMS-app view after scaning the last batch: how many pcs and or tons is on the user and confirm the put-away with single confirmation. Same as for production put-loc already has.