Make sure you are using build241 ( check in Help > About).

You will need to download usually a good 10% of the file ( depends how many sources you are getting the file from ) before it can preview *if* the file type is even supported to be previewed.

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Morgwen that *IS* what it does. It makes a copy of the segment that way it doesn't intefere with any file sharing violations in creating the complete file and avoids some other issues.

It also deletes all preview segments at every startup.

FYI