Install a Fabric Snapshot 26.1-snapshot-7 server through the Control Panel (Servers → Select your server → Game servers → Add Game Server → Fabric Snapshot 26.1-snapshot-7)
It took a minute to recognize that the LTD users were where I was supposed to put my files (or clients) into. But beyond that the service was otherwise fairly good and simple to use and allowed me to put in custom mod files.