Resolve Outlook Attach File disappearing

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In this example, when clicking on Attach File, the Attach File drop-down appears for only 1 second, and then collapses. Also, the text updating appears in the upper right hand corner of the drop-down.

 

Clearing your Generic Credentials for Microsoft Office may fix this error:

  1. Select the Windows Start icon > Control Panel.
  2. Select Credential Manager.
  3. Remove every entry under Generic Credentials



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