From Render>Render Setup…
The vital bit is to tick the Save File box, then click on the … ellipsis to open this dialogue box:
Check where it is going to save (you did set up a project folder for 3ds so it should go into the renderoutput folder there).
Give it a File name and set the type to PNG. That will open yet another box:
Change the Colors depth to RGB 24 bit and make sure that the Alpha channel is ticked to make the background transparent.
To get the rendered object into Animate CC, just drag it onto the stage (it will be added to the library automatically).