If you mean to upload your paper to ResearchGate: Not all publications are automatically added here. This depends on the journal or the publisher or on which other platform the bibliographic information is available. However, you may add your paper yourself. See this help page ("How to add research") for instructions how to add published or unpublished research to ResearchGate: https://help.researchgate.net/hc/en-us/articles/14293005132305