Solution : https://service.sap.com/sap/support/notes/1408532 (SAP Service marketplace login required)
Key words :
/saphelp_nw70ehp1/helpdata/en/c7/d4ca8e88fe49bc9c86892bb70bdc85/frameset, support mass data transfer, transport organizer web ui, oragnizer web ui location, transport profile parameter 'non_abap_wbo_inbox', symptom attaching large files, web browser restrictions, 'transport tool' tab, client upload mechanism, 'object list' tab
Related Notes :
| 1172252 | CTS+, 'attach file': Troubleshooting Guide |
| 1003674 | Enhancement for non-ABAP systems in CTS |