Realistically, that needs to be converted from VFR (variable frame rate) to CFR (constant) via Handbrake, then imported into PrPro.
In Handbrake, make sure in the Video tab you both set it to "CFR" in the little button thing, and set a specific frame-rate number also. If you leave it at a "source" or "same-as/auto" type setting, you'll still get VFR out.
Also check the compression settings ... it wanted to take my S7's 4k from 48Mpbs down to 1920x1080 at around 17 Mbps. I was not amused, so I created a preset that 1) kept the original frame-size and 2) was near to "placebo" settings for compression so it kept the original file data also.
Further, you can set up the queue within Handbrake so it can process several gigs of clips to CFR overnight.
Neil
HandBrake download page: https://handbrake.fr/downloads.php