This article mainly about how you can disable "Send Attachments using Adobe Cloud Storage Link" plugin in Microsoft Outlook show in below screenshot. 

Step 1: Click on Acrobat tab when you are drafting an email in Microsoft Outlook 

Step 2: Click on Settings

Step 3: Select "Never prompt while attaching." in Prompt while attaching category then click Ok.

Lastly, you will not receive any prompt that require you to Send Attachments using Adobe Cloud Storage Link when you attach PDF file to your email.