Actions "read only" when exporting GLTF

Im trying to export a model provided by an artist to my Godot project, but I found that most of the animations were missing. Then I noticed a lot of messages in my shell displayed during the export process saying that the animation could not be exported because the action was read only and that I should check NLA. I did, but of course, being a newbiew in Blender I could not find any way to solve this.
How can I solve this problem?

To export multiple animations to glTF, each Blender Action needs to be “associated” with the object it should animate in some way. You can do this by creating NLA Tracks or Stashed Actions.

Here’s a quick screen capture:

When this works correctly, you should see all animations available in the dropdown from

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