Media Library Bug

Hello,

Media Library in Storyline 360 seems to be overwriting my existing .mp4 with new upload if it has identical properties, but it's a different file name.

for ex. 

test_.mp4 is uploaded to media library, I then duplicate the source .mp4 and rename it to: test_2.mp4. I now have two files with identical properties, but two different file names. When I upload test_2.mp4, instead of uploading as it's own media, Storyline will replace test_.mp4 with test_2.mp4. 

Can I get some insight into what's happening here? I feel like I'm missing something. 

I have a workaround to where I re-export test_2.mp4 shortened by a second so some of the file properties change, but I'd like to understand what's going on with Storyline and why it doesn't treat this file as it's own! Thanks in advance :)