Seeking Platform for Cybersecurity Community with File Management

Hi all, I work for a technical cybersecurity company that has both on-prem and cloud solutions. We are looking to set up an online community and finding that we have a couple requirements that are making it hard to find a platform that fits both the Product team and my (Advocacy) needs. I want something engaging and modern for advocacy and engagement reasons and product needs something to allow on-premise customer to download (sometimes massive 5G) files and push communications. Is there anyone using something similar? We have struck out with Gainsight, Magentrix, and Zendesk for various reasons and most of the others I have looked at don't have any file management capabilities. Appreciate any help.