Excel - File wasn't available on site

I’m using ignition 8.3 version - Unable to download the excel or upload file shows as ‘File wasn't available on site’ , happening at a random manner , Does this has to check with browser side or to handle in ignition

To easily rule out your browser as the cause, try other browsers/a private or incognito window, or at least with all browser extensions disabled.

ok , will try , but the same is working for ignition 8.1 . We have only 2GB RAM allocated to ignition Does insufficient RAM has any work on this ?

Maybe. I'd expect to see an error in the gateway logs if that was the issue.

I will say 2gB is not a lot for an Ignition gateway, especially one running Perspective. Not impossible to make it work, but if you're constantly fighting for headroom your experience overall is going to suffer.