Document attachment flags (discord#6272)

* Document attachment flags

Documents the new attachment flags field and the flag `1 << 2` for the remix feature. I am not aware of any other flags on attachments.

* Update docs/resources/Channel.md

Co-authored-by: Lala Sabathil <[email protected]>

* Update docs/resources/Channel.md

Co-authored-by: advaith <[email protected]>

---------

Co-authored-by: Lala Sabathil <[email protected]>
Co-authored-by: advaith <[email protected]>

Author: 3 people

docs/resources/Channel.md

@@ -758,9 +758,16 @@ Embeds are deduplicated by URL.  If a message contains multiple embeds with the
 | ephemeral? \*  | boolean   | whether this attachment is ephemeral                                                    |
 | duration_secs? | float     | the duration of the audio file (currently for voice messages)                           |
 | waveform?      | string    | base64 encoded bytearray representing a sampled waveform (currently for voice messages) |
+| flags?         | integer   | [attachment flags](#DOCS_RESOURCES_CHANNEL/attachment-object-attachment-flags) combined as a [bitfield](https://en.wikipedia.org/wiki/Bit_field) |
 
 \* Ephemeral attachments will automatically be removed after a set period of time. Ephemeral attachments on messages are guaranteed to be available as long as the message itself exists.
 
+###### Attachment Flags
+
+| Flag     | Value  | Description                                                       |
+| -------- | ------ | ----------------------------------------------------------------- |
+| IS_REMIX | 1 << 2 | this attachment has been edited using the remix feature on mobile |
+
 ### Channel Mention Object
 
 ###### Channel Mention Structure