Hey,

So im wondering if there is something wrong, before 5.7.0 I was able to select a think that I wanted to construct and then I would show in the tool set to the left, from there I could transport ressource to the planet that needed the building. This isnt possible now, or changed in some way that I don't know about. So is this a bug or do I have to do it in a different way?

There has nothing been changed during the last updates. It's working fine for me.
Remind, the transport button isn't there if you are on planet where the construction is planned.

And please update to AGO 5.7.1

seems to be fixed