Prevent downloading into "locked" data layers (discouraged from upload)

[dieterdreist]

If you have data layers marked as "discourage upload", they could also be preventing loading data into them via the API. The usecase for these is typically external data that you are conflating (or that you use in others ways for your mapping but which you do not want to upload), and if you are not careful you might end up with OpenStreetMap-data mixed in via the download API (if the layer is active while you download new data and click "Download" rather than "Download to new layer"). IMHO when you do not want to upload the data you typically also do not want to merge OpenStreetMap data into it. In the improbable case that you still desire to merge OpenStreetMap data into your "own", you could first download the data into a new layer and then merge it afterwards.

If there are only data layers "discourage upload"-checked and you "Download" (from the OpenStreetMap editing API), a new layer should be created, and if there is only one other data layer it could be loaded into this. Otherwise, it should give a hint that you must first select an available destination layer if you just "Download".

[stoecker]

There are many reasons for "discourage upload". Some of them involve downloading data into the layers.

[anonymous]

It could also be an advanced setting (“download into discouraged layers”) or a modal warning (“you are about to download into an upload-discouraged layer…)