Quote:So it seems to me that when i do drag and drop in 2.10 onto the layer panel i get a new layer with the image i drag and dropped but i can no longer set up with layer properties a one parameter which sais "transparency"
Not too sure about either question.
For dragging and dropping a layer,
1) Into to Gimp Toolbox to open as a new image
or
2) Into another image to add as a layer
Check that the pixel lock is off otherwise you can not add an alpha channel.
and a 50 second example of that: https://i.imgur.com/M5O3eIO.mp4
It might help if you post a screenshot of the problem.