I'm in a situation where we allow staff to upload Microsoft Excel files to 
our servers, which we then parse and store the data in DynamoDB. 

I've only used file watchers once before, to watch for any change in a 
directory. These seemed to trigger when a file was created in a directory 
-- I recall I then tried to read from such files, but I got an error 
because the file was still being written. I'm curious if there are file 
watchers that I can have trigger when a file is fully uploaded, or fully 
copied? 

My goal is to avoid the errors that occur when I try to read from a file 
that is still being written to. 



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