could you investigate, why with my account i cannot send full-text using your on-line procedure to reply to requests? I'm using Google Chrome from my company site.
Please note that you wrote to the ResearchGate community, not to the RG team. You may try to contact RG's support team at https://www.researchgate.net/contact. Before doing that, I recommend to read the section "How do I add a full-text to my publication page?"
in this help page: https://help.researchgate.net/hc/en-us/articles/14293005132305. Perhaps you may solve the problem yourself.