Scenes Displaying Extremely Bright

I’m a new user to Forge, and trying to make my first scene for a campaign. Regardless of which background image I use, it does not display properly.

I am using the following as a background image:

But in Forge VTT, it appears as follows:

These are my settings for the scene - fiddling with them has not accomplished anything.

Can anyone give advice on troubleshooting? I’m on a Mac, if that affects possible solutions.