No picture appears on live version of my site.

Hello,NO PICTURE APPEARS ON LIVE VERSION OF MY SITE.

I am blocked trying to build my theme. I am using Spirit with Upfront.

When i want to put a picture (background or whatever), i have to go to the bottom of the window to see the "Upload button". Its weird but it seems that it's working. In a scd time, i can put the picture with Upfront but after i save and i refresh the live version of the site, no picture appears.

Can someone help me plz ?

Thx a lot.

Here is the thread with screenshots.
https://premium.wpmudev.org/forums/topic/no-picture-appears-on-live-version-of-my-site#post-975923