Darkle This is what you have now.
$ curl --head "https://brickdose.s3.eu-central-003.backblazeb2.com/uploads/2021-06-01/1622547581-230966-1.png"
HTTP/1.1 200
Cache-Control: max-age=0, no-cache, no-store
Accept-Ranges: bytes
Last-Modified: Tue, 01 Jun 2021 11:39:50 GMT
ETag: "647153f526417935a38c2ac287c014ba"
x-amz-server-side-encryption: AES256
x-amz-request-id: 25ad6e98e0507d87
x-amz-id-2: aN/sz9mGVZuc1wTMeZXg1nTh4Y2tlJGKh
x-amz-version-id: 4_z07431a2f15c3bee5789c0e1b_f113f3e0305e92a43_d20210601_m113950_c003_v0312006_t0003
Content-Type: image/png
Content-Length: 296512
Date: Tue, 01 Jun 2021 14:22:58 GMT
You need to adjust Cache-Control
header to allow browser caching. For example https://cdn.brickdose.com has Cache-Control: public, max-age=14400
+ proper Expires
and it is working fine.