AWS S3 upload - unable to sign request without credentials set

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Tried now, to set up IAM User with credentials and give it s3:* permissions, and now the upload works, but discourse can´t display it afterwards:

The image failed to load, resulting in a black screen with the text "The image could not be loaded." displayed. (Captioned by AI)
The image failed to load, resulting in a black screen with the text "The image could not be loaded." displayed. (Captioned by AI)716×269 4.46 KB

As I´m working in a company, and there are SCP (Service control policies) active for our accounts, it seems that public access is generally blocked

The image shows a settings page where public access is blocked for a bucket in Amazon S3. (Captioned by AI)
The image shows a settings page where public access is blocked for a bucket in Amazon S3. (Captioned by AI)1991×438 74.2 KB

Seems to be no S3 for me (and everyone having the same restrictions for his accounts)

Giving up now … :frowning: