Correct. Usually after the program roboots, but if you want to force it... there is an option in Preferences>Storage>Force Purge.
Media is only created during rendering, and Create Project media & proxies.
If you just import direct, as link with no transcode to prores, then no frames are put in the Autodesk Media Folder.
Brian Mulligan
Senior Editor - Autodesk Smoke
WTHR-TV Indianapolis,IN, USA
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@bkmeditor