Outlook AddIn 'OnMessageAttachmentsChanged' event is fired only for the first file.

[guzman-rc]

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When an email is created and several files are attached at the same time, the OnMessageAttachmentsChanged event is only triggered for the first file, subsequently, if you attach several files again, the OnMessageAttachmentsChanged events are triggered correctly, it only fails the first time when several files are attached.

Your Environment

• Platform [PC desktop, Mac, iOS, Office on the web]: PC desktop, Mac and Outlook on the web
• Host [Excel, Word, PowerPoint, etc.]: Outlook
• Office version number: ALL
• Operating System: Windows and Mac OS X
• Browser (if using Office on the web): Chrome

Expected behavior

Event OnMessageAttachmentsChanged should be triggered for all attachments.

Current behavior

When an email is created and several files are attached at the same time, the OnMessageAttachmentsChanged event is only triggered for the first file.

Steps to reproduce

1. Install the test Addin from the url: https://www.adarsus.com/addin/outlook_event/manifest_2.xml
2. Access your email account from Chrome and create a new email.
3. Open Chrome's log console and finally attach 2 files.
4. As you can see in the screenshot, the OnMessageAttachmentsChanged event is triggered for the first of the files.

Useful logs

• Console errors

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