I am having error uploading assets on assetstore

I'll be specific

I'm uploading an asset on the assetstore which is of 578 MB of size, my internet connection is slow of speed 100 kb/s and uploading speed 50 kb/s..But it is very stable... As per my calculation my asset will take 5.1 hours of time which is big as from my experience but i've tried uploading it 5 times to assetstore but it shows the error

Now i don't have 5.1 hours to spend everytime so i wanna know that this error is because of assetstore tools or my internet connection has a fault(Consider that i have uploaded other assets on other sites much times bigger than this using manual uploading similar like when assetstore tools was not available)

SO please help me