diff --git a/Pleroma/Pleroma.cs b/Pleroma/Pleroma.cs
index 8b3fe89..6761f89 100644
--- a/Pleroma/Pleroma.cs
+++ b/Pleroma/Pleroma.cs
@@ -669,7 +669,11 @@ public class Pleroma
     /// </summary>
     public async Task<Stream> DownloadStream(Attachment attachment)
     {
-        HttpResponseMessage res = await HttpClient.GetAsync(attachment.URL);
+        using HttpClient client = new HttpClient();
+        if (HttpClient.BaseAddress != null && new Uri(attachment.URL).Host == HttpClient.BaseAddress.Host)
+            client.DefaultRequestHeaders.Authorization = HttpClient.DefaultRequestHeaders.Authorization;
+
+        HttpResponseMessage res = await client.GetAsync(attachment.URL);
         res.EnsureSuccessStatusCode();
         return await res.Content.ReadAsStreamAsync();
     }