importing OS files to F5 BIG-IP

Good evening,

I am currently trying to upload two (2) OS files to our F5 load balancer.

OS versions and upload results:

1. BIGIP-13.1.3.4-0.0.5.iso: upload progress bar indicates 100%; upload is successful
2. BIGIP-15.1.2-0.0.9.iso: upload progress bar is stuck at 0%, even after several minutes

Does this suggest that perhaps my copy of BIGIP-15.1.2-0.0.9.iso is somehow corrupted? 

What factors may be preventing the successful upload of an .iso file?

Regards,

Michael Feliciano