There are many kinds of video codecs to compress and store video footage. H264 is the famous codec but recently dominating by H265 codec which is more better quality than h264. But h265 codec is not fully compatable for worldwide softwere and video platforms.
Letest camera coder for example Mavic 2 Pro Drone camera can shot H265 Mov format . Anyway you can import and edit that not imported mov file without convert as Same quality. To import that's unsupported file Adobe premiere Pro you need to do this short tricks.
Reason is Mavic 2 Pro camera compressed Mov video file as H265 codec. which is 32 bit. Adobe Premiere does not support recently 32 bit video footage editing.
How To Fix it and import on Adobe Premiere?
You don't need to worry about it . its very easy to fix it .
You need to change your all video footage extensions one by one.
For example Original file's extensions is .MOV Now you need to change this .MOV to .mp4 extensions. then you can import all video files by changing video extensions.
How change Video extensions ?
1, First Goto Control Pannel
2, Goto folder option(File Explorer option)
3, Go to view
4, there you can find Hide extension for unknown file types. uncheck the box (remove tick mark) and click on apply .
5, Go to your Video File Folder (where your mov file stored)
6, Right click on one video and click on rename and Replace to . MOV by .mp4 (becareful DOT must be there, don't give any space or don't use capital letter .MP4)
#if your file name as "video001.Mov" now its looks like "video001.mp4"
7 Save it. replace all videos mov extension by mp4.
8, Now ready to Import on premiere without convert & loss of quality. tipically this process works for adobe premiere cs 2018 and above. tested by me thanks.