1) The download button gets gray, the user can't see any error. Now I have version 10.7 and the button is just gray without any comment, but when I had 10.6, it wrote something like "you have to be signed in to download this data". 2) I don't know how is it federated. 3) Some geodata (in shapefile) loaded to portal like hosted feature layer. 4) I passed them a link.
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