This is a very old version of Movie Edit Pro from 2012.
This version does not support the HEVC/h.265 video format and resolution many drones use.
However, we need more information to confirm my initial diagnosis and be able to help with the issue(s) you are having:
The specification of your computer system including Windows version and program version, see this topic for what is required, and please quote processor and graphics card make/model in full, and also what monitor/screen resolution(s) you are working with if this is a laptop.
I would suggest you put this information in your profile signature so we do not have to keep asking for it.
Download and install MediaInfo and analyse one of the clips and post the results, see this tutorial on how to setup MediaInfo and analyse a video clip for all the data required.