In Learn, I could release the answers to assignments to individual students once they had submitted the assignment. But that isn't possible in Canvas.
The solution was to treat my solution files as assignments (I know, that's weird). I created an assignment for each homework solution. For the Display Grade As, I selected Not Graded. For the Assign to section, for the time being I left it as Everyone. Later, when a student submits an assignment, I can go back and change the Assign to from 'Everyone' to specific students. This allows only those students who have submitted the assignment to have access to the answers.
Hope that helps those of us who miss Learn's adaptive release for files.
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