Adding a tag to many entries at once

I started organizing entries into collections before I realized that they would not be portable. Now I want to switch to tags. I would like to be able to select all the items in a given collection and add a tag. Documentation suggests that I should be able to select a group of entries and drag them onto a tag, but when I select multiple entries at once, the tags disappear. In fact, all the content in the right-hand pane disappears. I think I must be doing something wrong. Any ideas?
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