What is the problem with uploading them one by one and doing a union in the transformation ?

Try converting the CSV to XLSX and then uploading....

I have done the same. Files were uploaded one by one and then have tried union in transformation.

Once union was done , when i am trying to load the new table in process model at that time I am getting this error.

Do you think uploading data in XLSV will help?

Are you getting data in your backend when you run a select query?

Also please try uploading an dummy excel file with one/two column and rows is that also not working ?

Hi @Abhishek Chaturvedi , I have tried uploading dummy files and still its not working. I am trying to understand if I am missing on any step in between.

1. I have multiple csv file , I am joining all data table into one file using Union
2. Then trying to load into "Process data model" to mark it as an activity table and then I am getting this error.

Is there any turnaround or am I missing any step where data from table need to get sync or is it because the data is pretty big (close to 4000K row item)

If the dummy file is not working then it's something to do with your Celonis environment. My suggestion would be to raise a ticket with Celonis.