It might already be common knowledge but thought I'd pass on the fact that I had a valuable 3.2GB .avi video file of family and friends needing to be uploaded to a cloud account but couldn't find anything anywhere to compress it. About to give up after hours of frustration I suddenly remembered Handbrake from years ago which took just 4/5 minutes to reduce it down to 30mb !

Can't recommend it highly enough, especially as it's free so hope it helps out sometime...

https://handbrake.fr/