doc(reprocessing): Clarify attachment caveats (#14864)

Author: jjbayer

docs/product/issues/reprocessing/index.mdx

@@ -49,8 +49,13 @@ should be aware of and understand before you begin reprocessing.
 - **Attachment storage needs to be enabled.** If your events come from
   minidumps or unreal crash reports, you must have [attachment
   storage](/platforms/native/enriching-events/attachments/#crash-reports-and-privacy)
-  enabled. **If the original minidump no longer exists in Sentry, sending an
-  event through reprocessing will cause it to have no stack trace at all.**
+  enabled.
+
+  If an event's minidump is missing for whatever reason, the event **will not be reprocessed**. Reasons include:
+
+  - Minidump storage is disabled.
+  - The project stores only a [limited number of minidumps](/platforms/native/guides/minidumps/enriching-events/attachments/#enabling-minidump-storage) per issue.
+  - You ran out of attachment quota.
 
 - **Quota applies.** Every event you choose to reprocess counts against
   your plan's quota a second time. Rate limits and spike protection do not