Sometimes not saving - work lost

Hey everyone,
Last night I lost some work because none of my apps wanted to save. It just stay on the load screen. Eventually I selected reload, making peace with loosing the work done but even then I received an error message something like “Looks like Appsheet servers are busy today, Try to reload again later”. This happened before as well.
My question, anyway after you pressed save and realising that something is wrong to cancel that save so that you do not loose work done?
Thanks
Hyman