When I imported the video clip (MOV) into Premiere Elements 2018, it is not recognized as a video file, but it has an audio file. When I used other media apps to open the file outside of Premiere Elements, it plays as a video file without any problem.
The newest iPhones have an option to record in what Apple calles "HEVC". It used a codec called "H.265" that remains tangled in corporate issues over licencing.
The current release of iOS from Apple includes the HEVC/H.265 codec. So, the 2019 version of Premiere Elements is supposed to work fine when installed on a Mac.
Windows does not have HEVC/H.265 codecs. Premiere Elements 2019 is not capable of editing those files. The "work around" is to use the (free) Handbrake to convert the H.265 to H.264.
Older iPhones have been using a "variable frame rate" in video files. Until version 2019, Premiere Elements on either operating system would balk on iPhone footage. Now variable frame rates should work.
(I can't verify any of this because I don't have any Apple products)