Prevent user close app without sync pending changes

[gioKelly]

Hi guys,

this is because I have seen (and already reported to appsheet support team) when users upload some files and they close the browser without finishing the Sync:

this is the error for the “uploaded” file:

so, not sure if you cna help me with any suggestions about how can I prevent this error, or maybe something to avoid the users to close the browser tab of the App if there is any pending change to sync…