We don’t recommend uploading high res files for proofing purposes. Low res pdf files should be sufficient for most online viewing and proof approvals. High res files will greatly slow performance of the online iBox viewers and will lead to a frustrating experience for users. The system does support large file transfers however best reuslts will be found in using low res proof files.
We also don’t recommend using AdSupplier as the repository of your high res publication files. In our opinion these are best kept locally in your Production Departmentfor placement on a magazine page.