Version:

• listmonk: [eg: v2.5.1]
• OS: [ubuntu 22.04]

Description of the bug and steps to reproduce:

I try to use AWS S3 private bucket to save medias and send a new campain.
File upload is going well in my bucket using credentials, but when I try to send a new campain, listmonk creates a presigned URL to get the file back. This URL is not working in my case. I get a 403 error because :

<Code>SignatureDoesNotMatch</Code>
<Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message>

The URL is build in this source code, but I cannot understand why the signature mismatch.
According to this StackOverflow post, it may be related to incorrect file path in the URL.

As a consequence, the campain stays indefinitively on the Running status