True, breaking it down might help, but then at the same time - the user should upload batch by batch, which means they cannot leave their PC until the upload session is completed. 

Hello, did anyone see issues (upload failure) while trying to upload e.g. 600 documents at once (PNGs, JPGs, PSDs, etc.). Document total size is around 600 MB.    If yes, how did you solve this?    Thank you in advance.