Change in how you can move pdfs out or in to parent item?
I tried today to move a file into a parent item (like I use to do). It didn't work and I discovered the new "Change parent item" in the menu. Is this a willed change in behavior? Surprisingly maybe, but I liked the old way very much. It lets you add a citation with the wand and then move the file into the new citation which lets you see if the wand finds the correct citation. Now I would have to create the parent item, then discover that the downloaded citation was faulty and then use "Change parent item" to remove the file from the parent item. I guess I've become old but this was better in the old versions of Zotero. I dislike using the menus and avoid it when I can.
Upgrade Storage
My use case was for an article which is presented as each page at a different URL. So I stored all pages as their own parent item, then moved all snapshots into one parent item and removed the now empty parent items.
Now I need to find the parent item n times in a dialog window, which is cumbersome. Drag and drop for moving the snapshot was much more intuitive.
I also see drag&drop no longer working to move attachments in 10.0.2 on Windows