is it possible to rotate an attachment in the preview view that was uploaded in the wrong direction In Salesforce?. I.E. upside down or sideways. Sometimes when we get documents from scans/faxes they are in the wrong direction.

Please try with below piece of code and let us know if this helps.

<apex:page id="page"> 
<style>
    .logo {
           -ms-transform: rotate(90deg); /* IE 9 */
           -webkit-transform: rotate(90deg); /* Chrome, Safari, Opera */
          transform: rotate(90deg);
    } 
    img:hover
    {
    cursor: default;
    transform: rotate(360deg);
    transition: all 0.3s ease-in-out 0s;
     }
 </style>
    <apex:image styleClass="logo" url="https://vigneshb1-dev-ed--c.ap2.visual.force.com/img/seasonLogos/2016_spring.png" id="rotate"/> 
</apex:page>

Regards,