Adding a picture from content library onto a button

Hi there, I tried to search the forum, I couldn't find the answer so sorry I have been busy posting questions these days....

Anyway, I put in a button and thought I would like to put a picture on the button and access the content library instead of creating my own, but I can't figure out how to access it when I have clicked on the button to edit?  Is this possible?

Thanks

T

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