Remove a limit on attachments in Mastodon API and document the changes in responses from vanilla mastodon

docs/Differences-in-MastodonAPI-Responses.md

@@ -0,0 +1,9 @@
+# Differences in Mastodon API responses from vanilla Mastodon
+
+## Flake IDs
+
+Pleroma uses 128-bit ids as opposed to Mastodon's 64 bits. However just like Mastodon's ids they are sortable strings
+
+## Attachment cap
+
+Some apps operate under the assumption that no more than 4 attachments ccan be returned, however Pleroma can return any amount of attachments

lib/pleroma/web/mastodon_api/views/status_view.ex

@@ -166,7 +166,7 @@ def render("status.json", %{activity: %{data: %{"object" => object}} = activity}
       sensitive: sensitive,
       spoiler_text: object["summary"] || "",
       visibility: get_visibility(object),
-      media_attachments: attachments |> Enum.take(4),
+      media_attachments: attachments,
       mentions: mentions,
       tags: build_tags(tags),
       application: %{