I have a new Mac version of Premiere Elements 12 and I am unable to add media (mov, avi, mpg, bmp and prel files). The prel files and mpg files were created using an older Windows version 4 or 6 and all files are stored on an external drive. When attemp

I have a new Mac version of Premiere Elements 12 and I am unable to add media (mov, avi, mpg, bmp and prel files).  The prel files and mpg files were created using an older Windows version 4 or 6 and all files are stored on an external drive.  When attempting to add media, I am prompted to use video importer, but I do not understand how to enter information in the pop up video importer window.  Additionally, I am unable to to find the user manual for Premiere Elements 12.  I am hopeful someone has experience the same issue and in a position to assist.  Kind Regards,  Donald