Unable to add picture as background to Storyline slide

Nov 14, 2023

I've tried from a blank slide and from the slide master and either way, when I get to the Format Background dialog box, the Fill tab is active and usable but the Picture tab is greyed out. I have followed these steps to no avail:
Background Design in Storyline 360 - E-Learning Heroes (articulate.com)

Any idea what could be wrong?  Screenshot attached. Thank you!

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