Hi PondScum69,
Are you trying to duplicate a project that you created in iMovie 10.1, or is this project from a previous version of iMovie? If you are working with a project from a previous version of iMovie, the project needs to be updated first.
Update projects and events from earlier iMovie versions
The file name “com.apple.flexo-tmp-b6ewjy” does not appear to be in the correct format. Where did you receive the source files? Are they saved to a library on your internal drive or an external drive connected to your Mac?
The iMovie User Guide explains how to duplicate a project:
Copy or move projects, events, or clips between libraries or storage devices
You can think of a library as the place to store all your stuff: a collection of one or more events. An event is a grouping of footage based on the date and time the clips were recorded, as well as the projects you create with them. Most of the time, you have only one iMovie library, but there are situations in which you might want to have more than one.
For example, you might want to create additional libraries so that you can:
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Back up your current project
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Create an archive of your events and projects on a separate (external) storage device
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Free up storage space on your Mac by moving iMovie events to another storage device
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Edit a project on another Mac
iMovie allows you to create additional library files in different locations on your Mac or on different storage devices. You can access and work on any library at any time from within iMovie. And you can move and copy clips and events between libraries.
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Connect a storage device that contains the target library to your Mac, or copy the target library to your Mac.
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Choose File > Open Library, and choose an option from the submenu.
You can choose from recently opened libraries, locate an existing library on your Mac, or create a new library.
The selected library is opened in the Libraries list, with the first event selected and its contents displayed in the browser.
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In the Libraries list, select the event that contains the item you want to move or copy.
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In the browser, select the item you want to move or copy.
Tip: To select multiple clips or projects in the same library, hold down the Command key as you click the items you want to select, or drag a selection rectangle around the items.
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Do one of the following:
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To move items between events or libraries: Drag the clip or project to another event or library.
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To copy items between events or libraries: Option-drag the clip or project to another event or library by first starting to drag and then holding down the Option key as you drag.
PondScum69, if this basic information does not get you back on track with your current iMovie project, please reply to this thread with more information about your issue and we'll do our best to help.
All the best to you in 2016!