There are many different video editing tools available to reduce the size (MB) of exported videos. One of the tools we recommend is a free download called Handbrake.
Here's how to compress a video in Handbrake:
1) Click Open Source and select a video file for compression.
2) Check the box Web Optimized.
3) Provide an output file name in the field Save As and select the destination.
4) Click Start.
The encoding process might take a few minutes. A progress bar will appear at the bottom and a pop-up message will appear when finished.