Visual information on cross collection adding
The only way I know to add an zotero item to another collection/library, is dragging it to the collection icon in the left tree pane. By hovering over the collection the collection should light up. This can also be done with a selection of items. However, when items are already in the collection, collection does not light up when hovering. In that case it is not clear if you hover over the wrong area, or that the items are already in the collection. It would be more informative if the collection lights up in a different color (red for example).
When adding a selection of items, it would be usefull to have a popup that shows which items are already in the library.
See also: https://forums.zotero.org/discussion/50172/add-to-collection-by-drag-and-drop-not-working-always
When adding a selection of items, it would be usefull to have a popup that shows which items are already in the library.
See also: https://forums.zotero.org/discussion/50172/add-to-collection-by-drag-and-drop-not-working-always