File component and tinyDB

While using thunkable i discovered file component , my question is that can i use it to write excel file and export it on my android device ?
if yes can i also append to an existing one?
if yes please provide me with an aia file for than or a tutorial.
One more question I want to use my app like a stock so what condition may lead to my tinyDB to disappear or corrupts in it .
Sorry for my beginner questions but my app will be used as stock in company and there must be no fault in it.
Thank you .