[galaxy-user] Problem with executing larger files

Hi, Earlier I tried to upload larger bam files (3.5GB, 3.4GB and 4GB) to Galaxy account, but failed.  Your advice was to use FTP upload at http://wiki.g2.bx.psu.edu/FTPUpload. I followed the screencast in the website and did exactly as it has advised. I used FileZilla ftp client, uploaded the files to Galaxy account and executed. Now the problem is at the execution step. For example, my 3.5GB file is accurately uploaded, but once I execute the file I get is 2.5GB. The file seems to be somehow truncated. Please advice! Thanks Dhanushki