Keeps flashing – Video Mixer to Combine Videos Review

I paid for the upgrade it said you can upload more video then it just sits there saying "merging--please don't leave this app" then nothing happened.. I plug my phone in one night left it on so it wouldn't shut off woke up the next day and it still was doing the same thing. I was ok with this at first but now it's starting to be a disappointment
Review by Jimmy Nutron13 on Video Mixer to Combine Videos.