You right click on it.
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Open the chest and then you will be able to drag items into the chest, in which they will then be removed from your inventory.
Sometimes it is lag. But in this case, it seems like you have a block on top of your chest. If you put a block on your chest, the chest wont open.
If you have the chest slot empty in your armor inventory, Shift click or drag the Elytra into the chest slot.
Just right click
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