ResearchGate is not a publisher, you cannot publish a paper here. It is a platform for papers published in journals, or to present unpublished texts, data etc. See also "Is ResearchGate a publisher?" in https://help.researchgate.net/hc/en-us/articles/14292596164753. See this help page ("How to add research") for instructions how to add published or unpublished research to ResearchGate: https://help.researchgate.net/hc/en-us/articles/14293005132305
In continuation with Wolfgang. Its better to look those publication platforms which are more pertain to you work. If not? the cited link of Wolfgang is a helping link..Good luck.
"ResearchGate is not a publisher and does not accept articles or papers for publication. Rather, members can track their publications, store private copies, and make their published or unpublished work publicly available on ResearchGate – if they have the rights to do so".
This is an answer from ResearchGate itself when you start using it.
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