This works great until it doesn&#x27;t. Sometimes when you try using the &quot;Share&quot; or &quot;Open In...&quot; buttons, the medium you want to use is not an option. If that&#x27;s the case, there is no way to manually change it. For example: we have guys who use iPads instead of PCs. When we were first implementing this, we discovered that even though they had Excel for iPad installed, you couldn&#x27;t open an Excel document attached to an email in Excel. The Open In... dialogue didn&#x27;t offer Excel as an option. I ended up just using Numbers instead, which brought its own problems (like not fully supporting the .xlsx format).