In my project, even if I set the game artwork (in the project setting) and upload the image successfully, it will become a dead image after a while.
How should I fix it?
Hi @Joby.Wong and welcome,
I gave it a try on a project of mine and it seems to work as expected:
Maybe the image file has a problem? Can you try another one?
I have same problem here!
In fact I have tried a lot of pictures and even changed a computer to try it, but I still have this problem.
That is strange, I can also change my project’s image without issue. Could you send the picture you’re trying to add? Maybe the picture is corrupted in some way?
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I am having the same issue today with both png and jpeg files. Perhaps something has changed with the storage as the file is returning Access Denied.
Hmm, I can’t seem to reproduce this in my temp account 
I can’t reproduce the issue you are seeing unfortunately:
Can you zip up the image and send it to me/post here with the zip please
Sent those through to you.
Interestingly shows correctly in the Editor:
But not in project settings:
Really odd, could you add the logo to a public project so I can take a look on my end?
I can’t repro the issue with the image you sent me so the image is not the issue
Created issue for this here: Uploaded thumbnails are returning 403s · Issue #885 · playcanvas/editor · GitHub
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We have been investigating and having trouble trying to work out where the failure point i
It looks like it’s somewhere on the backend but we’ve been unable to reproduce the issue our selves 
Do you get any console messages in devtools when uploading the image?
CC’ing @yak32
Looks like this issue also means that you can’t export an archive of the project so we are raising the priority of this issue.
@mr-jose @Joby.Wong @KyungseokMIN We released a possible fix for the project thumbnail upload, can you please retest?
Nope, still have same problem,
Hi, have you tried reuploading the picture?