* Check if there is data in the first tab (spreadsheet) of the file you are trying to upload. We always consider the first tab;

* Check if the file you are trying to import has any data;

* Check if the file is in a format accepted by TaticView;

* TaticView reads the first ten columns (on the first visible tab in XLS and XLSX files) of the file to detect the data columns. In case the columns are not found, the process is aborted;

==== <span id="InvalidXLSXFormatException"> <span id="NotOOXMLFileException">XLSX file is in an invalid format</span></span> ==== <!--T:19-->