Hey Tanuja,
For each app template, there is an expected list of input files, see Process Mining - App Templates. So if you want to use those templates out-of-the-box, you’d need to provide data in that format.
If you already loaded data before and are just re-uploading one file, then you can ignore this warning.
If you have incident event log data in a different format, then you should also proceed loading the data, but it would require you to change the SQL queries in the Data transformations of the app.
Hope this helps.