It can be seen that right now dragging and dropping into Dash to Panel is opening Gnome Activities Overview. Where you can further locate the window where you would like to drag and drop.

While it is not a bad experience at all, I just though that giving people an alternative option to
Drag and Drop directly into Dash To Panel preview windows would be more straightforward.
Note: I do not mean to drop directly into preview windows, rather the expanded windows and their parts that show up after hovering over the preview windows.

Thanks @BoQsc! I'm not necessarily opposed to this, but I'm not clear on how you are envisioning the details to work. If you currently drag and drop over anywhere in the panel, the overview opens. Are you suggesting that if they then moved over to be hovering over an application icon, the overview would close and the preview would open instead?
Thanks @BoQsc! I'm not necessarily opposed to this, but I'm not clear on how you are envisioning the details to work.
If you currently drag and drop over anywhere in the panel, the overview opens.
Are you suggesting that if they then moved over to be
- hovering over an application icon,
- the overview would close and the preview would open instead?
I think you understood correctly @jderose9 :
Windows 10 as a basic reference, a visual representation
(Windows 10 looks similar to what I suggest, but not exactly )

So, I attempted that a couple of years ago and wasn't able to do it without upstream changes, as you can read here:
https://github.com/home-sweet-gnome/dash-to-panel/issues/46#issuecomment-283208983
But, since @charlesg99 reworked the preview windows a few months ago, I think we may no longer be a slave to the grab handler that was eating all of the event information. It's definitely worth revisiting.
I would love to see this setting happening.
To me it is also a matter of performances (as generating the Gnome Activities Overview can be a sluggish on my laptop) and usability (quicker to hover on your app of interest to drop your file than look around in the overview).
Leave the mouse over the panel doesn't works to me. I have to side over it:

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.
I would still be excited to get this feature back to Ubuntu! Thanks to anyone who could work on this!
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So, I attempted that a couple of years ago and wasn't able to do it without upstream changes, as you can read here:
https://github.com/home-sweet-gnome/dash-to-panel/issues/46#issuecomment-283208983
But, since @charlesg99 reworked the preview windows a few months ago, I think we may no longer be a slave to the grab handler that was eating all of the event information. It's definitely worth revisiting.