Not seeing iCloud as option for folder selection on iPhone

I’m new to Logseq and trying to install and set up iCloud sync my iPhone 11 and Macbook. On the iPhone app, I don’t see an option to use iCloud.

Instead I see “Dropbox” (grayed out) and “On my phone”. I think when I first launched the iPhone app, it asked me whether I wanted to use iCloud or local. I mistakenly chose local. But now no amount of uninstalling / reinstalling the iPhone app or rebooting my iPhone gives me that option again.

When I look at my iCloud storage I see that a new folder has been created at the root level called Logseq. But it’s empty, and I don’t know how to tell the app to access it.

Can anyone help?