Tried to update a track, couldn't change the screenshot, tried to delete screenshot and it just sends me to an error:

https://trackmania.exchange/error/404?aspxerrorpath=/tracks/delete_screenshot/1226
"This page could not be found."

So I tried to delete the track, which does the same thing. Here is the map in question:
https://trackmania.exchange/maps/1226/fragile-trees

From the track page while logged in, in Author Options I tried Update, Screenshot, I clicked the Trash icon. I also tried Author Options, Delete, Screenshot, same result, as well as with the track.

Hey miahelf,

my bad, I forgot to hide the buttons. You can now manage your map images from the button "Manage Images".

Perfect, thanks it works now