IMPORT problems

Just found ZOHO last night and now giving it a try. Can't seem to IMPORT any of my files in XLS.

Is there a limit to size, rows or columns ? I have files of some 13,000 rows with approx 10 columns.

These are newly re-constructed roster of YS Army Divisions. I have them on a website as HTML, but very cumbersome and not inter-active. www.IndianaMilitary.org, 106th Division, Roster

Thanks