If I understand you correctly, you are trying to use the IPFS Web UI to interact with a remote Kubo node that is secured with a JWT token.
I should point out a new guide that we just published last week that covers how to set up Basic HTTP Auth in Kubo along with Caddy for TLS termination: Secure Kubo RPC with TLS and HTTP Auth | IPFS Docs
I just submitted a PR to improve the guide and also show how to configure CORS so that you can use the IPFS Web UI deployed at https://webui.ipfs.io/ with the configured Kubo RPC endpoint
Here’s a preview of the updated guide here: Secure Kubo RPC with TLS and HTTP Auth | IPFS Docs
Hopefully that helps, but once it’s configured this way, you can share the URL with the basic HTTP credentials and they will be able to interact and upload files to your IPFS Node.