at present, a project needs to do a resource management system. At present, the system can only be used in the intranet environment of the customer group, as long as each branch can be accessed through the intranet. However, customers put forward the need to have access to the external network, and the current method is to use VPN to connect to the internal network to access the system. But the customer"s intranet system is very slow, uploading a picture is barely possible, if the larger file will affect the phase rate.
at present, I can think of
1. The external network can also build a system to allow the internal network server and the external network server to carry out Synchronize through the file Synchronize mechanism, so that the speed through the internal and external network is guaranteed. But in this case, there is a problem is that the operating costs of the two systems will be very high, the server capacity of the external network is limited, and the cost of expansion is much higher than that of the internal network.
2. Put the system completely on the external network, but that will certainly not work. The system still needs to access
3 through the internal network. The external network makes a channel, only uploading and reading files, and the actual files are still stored in the internal network. But I don"t know if the requirement of bandwidth speed is higher in this way, and I don"t know whether it can be realized or not.

also ask the great gods who have experience in this field to help think of a way, thank you