Someone needs to implement this guide and prepare the document in this URL: https://michaeljcole.github.io/wiki.unrealengine.com/How_To_Package_Extra_NonUASSET_Files_With_Your_Game/
There are onUASSET(videos,texts....) files which you expect UE4 to load but dioes not get added when u package the agme .
Moves Files :
Make sure your files are exist in a susbfilder under your cunreal prjects content folder .
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now do packaging and files will be aded in packaged project