Please help! free online version crashed down and now it says when I try to open: seems like it is not a sketchup model

Please help!!!

I cannot open my file anymore since the internet crashed and the free version of sketch up crashed down. I really tried to save a backup but it has 0 bites now… When I try to open the online saved file it looks broken and a warning says “i seems like this is no sketch up model”

Can I do anything to open my work again??? It was a lot of work and I want to cry. :frowning: