like this

lib/pleroma/web/endpoint.ex

@@ -23,6 +23,18 @@ defmodule Pleroma.Web.Endpoint do
   # InstanceStatic needs to be before Plug.Static to be able to override shipped-static files
   # If you're adding new paths to `only:` you'll need to configure them in InstanceStatic as well
   # Cache-control headers are duplicated in case we turn off etags in the future
+  plug(
+    Pleroma.Web.Plugs.InstanceStatic,
+    at: "/",
+    from: :pleroma,
+    only: ["emoji", "images"],
+    gzip: true,
+    cache_control_for_etags: "public, max-age=1209600",
+    headers: %{
+      "cache-control" => "public, max-age=1209600"
+    }
+  )
+
   plug(Pleroma.Web.Plugs.InstanceStatic,
     at: "/",
     gzip: true,
@@ -59,18 +71,6 @@ defmodule Pleroma.Web.Endpoint do
   #
   # You should set gzip to true if you are running phoenix.digest
   # when deploying your static files in production.
-  plug(
-    Plug.Static,
-    at: "/",
-    from: :pleroma,
-    only: ["emoji", "images"],
-    gzip: true,
-    cache_control_for_etags: "public, max-age=1209600",
-    headers: %{
-      "cache-control" => "public, max-age=1209600"
-    }
-  )
-
   plug(
     Plug.Static,
     at: "/",