Since I recently published my first ever paper, I was creating some accounts for various social networks and preprint servers. I have to say, I am a little bit confused by ReseachGate: If I have already uploaded a paper to arXiv and I also want it to be on ResearchGate, do I have to upload it separately on ReseachGate (I am not able to find any way to crosslink my arXiv paper on ResearchGate)?
And what if my preprint gets published later on? Is it then still "legal" that the paper is available for everyone on ResearchGate, or do I have to be careful in order not to run into any copyright problems?