Can’t move/copy file from main library to group library in ios

I have a pdf which hasn’t got a parent entry (no option to sync with metadata) in my main library on iOS that I want to transfer/copy to my synced group library.
I can drag the pdf over to the left panel and navigate to the group library icon but it won’t accept the file drop action into the group library. It doesn’t get the plus indicator as it does on folders within the main library and just zips back to the right panel when released.
It is my group library and so permission shouldn’t be an issue.

The background is I’m not syncing my main library because it is so enormous I’d have to jump straight to unlimited storage and I’m not ready to pull the trigger there yet. Thanks!
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