Welcome to the forum.
Also, you might have issues with the .MVI files, as they are not a supported PrE format. Perhaps something in this Google Search will be helpful? https://www.google.com/search?q=mvi+files+on+mac&oq=MVI+file&aqs=chrome.4.69i57j0l5.9670j0 j7&sourceid=chrome&es_sm=93&ie=UTF-8
Before we go off the deep edge here, perhaps some clarification.
What is the brand/model/settings for the Canon camera that you are using?
I think that Hunt may be being jumping ahead here. Let me explain....
For example, the Canon SX1 lS generates files with the file name starting with MVI_XXXX.mov. These are AVCHD.mov files 1920 x 1080p30 and have no problems in Premiere Elements 12.
So, I would ask "In your case, is your MVI the file extension or the beginning of the file name?"