Testing.md

@@ -100,5 +100,6 @@
 * [Mailbox in Briar settings](mailbox-in-briar-settings)
 * [Mailbox onboarding share link](mailbox-onboarding-screens-share-link)
 * [WIP Mailbox onboarding scan QR Code](mailbox-onboarding-screens-scan-QR-Code)
+* [WIP Error handling for mailbox uploads](error-handling-mailbox-uploads)
 
 ### Mailbox app
\ No newline at end of file