Photo to Movie stores references to your files, not copies. So if you move the document or photos or music, Photo to Movie can have trouble finding the original photos and music.
The best way to handle things is to store your photos and music in the same folder as your Photo to Movie document. Then when you move the document/photos/music, Photo to Movie will be able to find your photos easily. See Gathering media into one location.
Photo to Movie may report one or more of your photos or songs as missing when you re-open a document.
If this happens, you can manually tell Photo to Movie where the media is located.
Replacing missing photos or audio
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Find the missing photos or audio in the timeline. Missing media will have a red circle in the timeline.
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For photos, choose → .
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For audio, choose → .
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Locate the original file in the file dialog that appears.
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Repeat the steps above for any remaining missing media.
Once you locate one missing media item manually, Photo to Movie will often be able to find the rest automatically.