Hi Techaspect Solutions,
what you are saying is correct for dragging and dropping an image from asset finder, but when you need to drag and drop an image in the dialog tab of a component, then it is not possible to drop it from the asset finder , since the dialog is also open as full screen on the device(tablet)
in the image component, the sling resourcetype is set as -
cq/gui/components/authoring/dialog/fileupload
then when the dialog is open, it is not possible to drag and drop an image form the asset finder since the dialog is open full screen. Hope you understand the predicament
Thanks