Videos seem to need conversion

I am making some promotional videos of equipment sold at work.

We use a DJI mavic pro 2 drone and an iphone to record the footage. When i import the footage into premiere pro it either crashes, says media pending or plays in a very juddery way then stops playing altogether.

I was told i need to convert the video formats before importing it to premiere pro. Somewhat dissapointing given the price of the software if it cant do this iself. Am i doing something wrong or is support for these devices and their video formats in the pipeline.

Also i wonder if this computer is adequately specified for running premiere pro.

Processor - i7-8700K 3.7 Ghz

Ram - 16Gb

Nvidia Quadro P1000 Graphics card

SSD hard drive

Windows 10 64bit

All software is fully up to date.

I use a 5 year old mac at home with final cut pro and using the same cameras never have these issues.