Do I have to use IMCE?
No. Acquia Cohesion allows the site builder to select, either use of IMCE or Entity browser for browsing and selecting images.
Within the Acquia Cohesion system settings the site builder has the ability to select either IMCE or Entity browser (if installed) to upload, browse and select images throughout you website. Find out more about using media browsers with Acquia Cohesion.