Can't add screenshot to my extension

[rastersoft <raster rastersoft com>]

Hi all:

I published an extension some time ago:
https://extensions.gnome.org/extension/1149/activity-app-launcher/

Unfortunately I'm unable to upload an screenshot. Clicking on the
"Upload an screenshot" gray rectangle does nothing, neither uploading a
picture with the "Examine..." button located to the right of that
rectangle. I can edit the description, add new comments or upload new
versions, but can't upload an screenshot.

I published other extensions but never had this problem :?

-- 
Nos leemos
                         RASTER    (Linux user #228804)
raster rastersoft com              http://www.rastersoft.com