I'm replacing an old ceiling fan in my bedroom, In the old one I have two ground wires which are connected to the plate.
In the new one I have connections for four wires.
Can I twist the two ceiling wires together and put them into the screw connector as one or do I have to put one to the connector and one to the plate.
Thanks

As long as they have continuity, they can be attached to the box or fan hanger. You may find it easier to pigtail a single wire to the doubles and then you will only have 1 wire to screw down.

All grounds must be connected together, and all metal boxes must be grounded/bonded.