diff --git a/error-handling-mailbox-uploads.md b/error-handling-mailbox-uploads.md
index 34e7032..5b5ebe7 100644
--- a/error-handling-mailbox-uploads.md
+++ b/error-handling-mailbox-uploads.md
@@ -5,4 +5,12 @@ Circumstances that could cause messages to be lost:
 - device crash
 during the messages and acks are being written to a file
 
+If this happens, that it means that we cannot be sure that the messages/acks are written to the file correctly.  
+
+How to know the precise moment when the messages are being written to a file? Is there anything visible on screen to indicate that?
+How to know, as a user, if the file is sent and thus which messages were sent correctly or received correctly by the mailbox (own or contact's in case that the writer doesn't have one)?  This would be necessary to know, so we can check that any messages not delivered correctly still show in Briar mailbox as 'not sent' and can still be re-sent?
+
+
+
+
 [Back to Testing](https://code.briarproject.org/briar/briar/-/wikis/testing)
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