Due to upcoming changes the feature to upload playthrough demo files will be removed. It was never used much and the online world has changed a lot since it was added. People seem to prefer to watch video captures to demo files.
I will remove the uploading form in the coming days. The demo files will of course stay available at https://www.quaddicted.com/files/demos/ and I will add a dump of their metadata in that directory.
I’d rather you didn’t remove the feature. I look for demos at times and find it a handy thing sometimes.
That’s a shame.
As long as they are still available to download that’s completely understandable.
But… I wonder what the “upcoming changes are”? Intrigued.
It is quite seldomly used:
18 2013
76 2014
16 2015
13 2016
13 2017
34 2018
22 2019
43 2020
13 2021
23 2022
Some info on the rebuild progress: https://www.quaddicted.com/forum/viewtopic.php?pid=7504#p7504
Once running fully, demos could just be uploaded anywhere, added as files with appropriate metadata and map/mod pages could list them again.
This is great news. I wish i could help code but happy to help in other ways: financially, promotion or testing when the time comes.
Can’t call it a year yet! 
I just finally removed the feature, sorry for forgetting.
There I go, trying to help someone in lunchtime 23 okt 2022. Making a demo to help adding some light on a map question.
These a tragic bandwidth urges.
/P