I would like your urgent help please.

I have a really big problem with all my files on my S3 bucket. Until some days before, all was ok, but from this time, all files (images, videos etc) from bucket, dissapeared from my app!

I noticed that when I open a file from its url return me AccessDenied. I tried to add a bucket policy to my bucket, and then it returns me this:

InvalidRequest
The object was stored using a form of Server Side Encryption. The correct parameters must be provided to retrieve the object.

Note that if I try to add new file, it’s ok, but when I try to open via it’s url an old file, it doesn’t work.

I navigated to some files from AWS Management Console and I saw that it says that it is encrypted with this way (see screenshot): (Old file access denied https://snipboard.io/jFoQcm.jpg , new file access ok https://snipboard.io/P7gyrT.jpg ).

Why this occurs and how we can solve it? We really changed nothing to our app (where files are uploaded) or in aws settings.

Please help me to solve this problem, unfortunatelly my whole app doesn’t work right without aws bucket files.

Thank you in advance.

I contacted with Amazon support but they didn’t reply yet.