I had a problem uploading large video files taken on my 'phone to my laptop - it tended to randomly drop the collection - it could be the data cable picking up interference from the 'phone talking to the network - I found that if I rerouted the data cable away from the 'phone, or put it in 'aeroplane' mode, it became reliable - I hope this works for you! :) As I was filming this on my 'phone, an external drive was used as a pretend 'phone. Do comment if this works for you, better still, drop me a 'like/subscribe' to keep small channels like this alive in the face of the increasing dominance of slick money making and advertising dominated entertainment channels:D
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https://www.youtube.com/watch?v=Jl9Us1vAuao